diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/LUIS-Authoring.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/LUIS-Authoring.json
index a7335b87f6b5..02fe2bdb6ec7 100644
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/LUIS-Authoring.json
+++ b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/LUIS-Authoring.json
@@ -303,6 +303,9 @@
           {
             "$ref": "#/parameters/VersionIdInPath"
           },
+          {
+            "$ref": "#/parameters/EnableNestedChildren"
+          },
           {
             "name": "exampleLabelObject",
             "in": "body",
@@ -351,6 +354,9 @@
           {
             "$ref": "#/parameters/VersionIdInPath"
           },
+          {
+            "$ref": "#/parameters/EnableNestedChildren"
+          },
           {
             "name": "exampleLabelObjectArray",
             "in": "body",
@@ -408,6 +414,9 @@
           },
           {
             "$ref": "#/parameters/TakeInPath"
+          },
+          {
+            "$ref": "#/parameters/EnableNestedChildren"
           }
         ],
         "responses": {
@@ -2342,6 +2351,9 @@
           },
           {
             "$ref": "#/parameters/TakeInPath"
+          },
+          {
+            "$ref": "#/parameters/EnableNestedChildren"
           }
         ],
         "responses": {
@@ -2389,6 +2401,9 @@
           },
           {
             "$ref": "#/parameters/TakeInPath"
+          },
+          {
+            "$ref": "#/parameters/EnableNestedChildren"
           }
         ],
         "responses": {
@@ -3413,168 +3428,6 @@
         }
       }
     },
-    "/apps/{appId}/permissions": {
-      "get": {
-        "description": "Gets the list of user emails that have permissions to access your application.",
-        "operationId": "Permissions_List",
-        "parameters": [
-          {
-            "$ref": "#/parameters/AppIdInPath"
-          }
-        ],
-        "responses": {
-          "200": {
-            "description": "The list includes a single owner. All collaborators are listed in the emails array.",
-            "schema": {
-              "$ref": "#/definitions/UserAccessList"
-            }
-          },
-          "default": {
-            "description": "Error Response.",
-            "schema": {
-              "$ref": "#/definitions/ErrorResponse"
-            }
-          }
-        },
-        "produces": [
-          "application/json"
-        ],
-        "x-ms-examples": {
-          "Successful Get Application User Access List": {
-            "$ref": "./examples/permissions/SuccessfulGetApplicationUserAccessListRequest.json"
-          }
-        }
-      },
-      "post": {
-        "description": "Adds a user to the allowed list of users to access this LUIS application. Users are added using their email address.",
-        "operationId": "Permissions_Add",
-        "parameters": [
-          {
-            "$ref": "#/parameters/AppIdInPath"
-          },
-          {
-            "name": "userToAdd",
-            "in": "body",
-            "required": true,
-            "schema": {
-              "$ref": "#/definitions/UserCollaborator"
-            },
-            "description": "A model containing the user's email address."
-          }
-        ],
-        "consumes": [
-          "application/json"
-        ],
-        "responses": {
-          "200": {
-            "description": "Successful operation.",
-            "schema": {
-              "$ref": "#/definitions/OperationStatus"
-            }
-          },
-          "default": {
-            "description": "Error Response.",
-            "schema": {
-              "$ref": "#/definitions/ErrorResponse"
-            }
-          }
-        },
-        "produces": [
-          "application/json"
-        ],
-        "x-ms-examples": {
-          "Successful Add User To Access List": {
-            "$ref": "./examples/permissions/SuccessfulAddUserToAccessListRequest.json"
-          }
-        }
-      },
-      "delete": {
-        "description": "Removes a user from the allowed list of users to access this LUIS application. Users are removed using their email address.",
-        "operationId": "Permissions_Delete",
-        "parameters": [
-          {
-            "$ref": "#/parameters/AppIdInPath"
-          },
-          {
-            "name": "userToDelete",
-            "in": "body",
-            "required": true,
-            "schema": {
-              "$ref": "#/definitions/UserCollaborator"
-            },
-            "description": "A model containing the user's email address."
-          }
-        ],
-        "consumes": [
-          "application/json"
-        ],
-        "responses": {
-          "200": {
-            "description": "Successful operation.",
-            "schema": {
-              "$ref": "#/definitions/OperationStatus"
-            }
-          },
-          "default": {
-            "description": "Error Response.",
-            "schema": {
-              "$ref": "#/definitions/ErrorResponse"
-            }
-          }
-        },
-        "produces": [
-          "application/json"
-        ],
-        "x-ms-examples": {
-          "Successful Remove User From Access List": {
-            "$ref": "./examples/permissions/SuccessfulRemoveUserFromAccessListRequest.json"
-          }
-        }
-      },
-      "put": {
-        "description": "Replaces the current user access list with the new list sent in the body. If an empty list is sent, all access to other users will be removed.",
-        "operationId": "Permissions_Update",
-        "parameters": [
-          {
-            "$ref": "#/parameters/AppIdInPath"
-          },
-          {
-            "name": "collaborators",
-            "in": "body",
-            "required": true,
-            "schema": {
-              "$ref": "#/definitions/CollaboratorsArray"
-            },
-            "description": "A model containing a list of user email addresses."
-          }
-        ],
-        "consumes": [
-          "application/json"
-        ],
-        "responses": {
-          "200": {
-            "description": "Successful operation.",
-            "schema": {
-              "$ref": "#/definitions/OperationStatus"
-            }
-          },
-          "default": {
-            "description": "Error Response.",
-            "schema": {
-              "$ref": "#/definitions/ErrorResponse"
-            }
-          }
-        },
-        "produces": [
-          "application/json"
-        ],
-        "x-ms-examples": {
-          "Successful Replaces Users From Access List": {
-            "$ref": "./examples/permissions/SuccessfulReplacesUsersFromAccessListRequest.json"
-          }
-        }
-      }
-    },
     "/apps/{appId}/endpoints": {
       "get": {
         "description": "Returns the available endpoint deployment regions and URLs.",
@@ -8149,6 +8002,22 @@
         "role": {
           "description": "The role the entity plays in the utterance.",
           "type": "string"
+        },
+        "children": {
+          "description": "The identified entities within the example utterance.",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/EntityLabelObject"
+          },
+          "type": "array",
+          "example": [
+            {
+              "entityName": "child",
+              "startCharIndex": 0,
+              "endCharIndex": 0,
+              "children": []
+            }
+          ]
         }
       }
     },
@@ -8319,6 +8188,21 @@
         "role": {
           "description": "The role the entity plays in the utterance.",
           "type": "string"
+        },
+        "children": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/JSONEntity"
+          },
+          "example": [
+            {
+              "entity": "child1",
+              "startPos": 0,
+              "endPos": 0,
+              "children": []
+            }
+          ]
         }
       }
     },
@@ -9278,6 +9162,21 @@
           "type": "string",
           "format": "uuid",
           "description": "The role id for the predicted entity."
+        },
+        "children": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/EntityLabel"
+          },
+          "example": [
+            {
+              "entityName": "child",
+              "startTokenIndex": 0,
+              "endTokenIndex": 0,
+              "children": []
+            }
+          ]
         }
       },
       "required": [
@@ -9325,6 +9224,21 @@
         "phrase": {
           "type": "string",
           "description": "The actual token(s) that comprise the entity."
+        },
+        "children": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/EntityPrediction"
+          },
+          "example": [
+            {
+              "entityName": "child",
+              "startTokenIndex": 0,
+              "endTokenIndex": 0,
+              "phrase": "string"
+            }
+          ]
         }
       }
     },
@@ -10604,6 +10518,9 @@
         "featureName": {
           "type": "string",
           "description": "The name of the feature used."
+        },
+        "isRequired": {
+          "type": "boolean"
         }
       }
     },
@@ -10847,6 +10764,14 @@
       "type": "string",
       "in": "path",
       "x-ms-skip-url-encoding": true
+    },
+    "EnableNestedChildren": {
+      "name": "enableNestedChildren",
+      "in": "query",
+      "type": "boolean",
+      "default": false,
+      "description": "Toggles nested/flat format",
+      "x-ms-parameter-location": "method"
     }
   }
 }
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulAddLabelRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulAddLabelRequest.json
index 9a7220daa4e3..5512edd005fc 100644
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulAddLabelRequest.json
+++ b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulAddLabelRequest.json
@@ -4,6 +4,7 @@
     "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
     "appId": "86226c53-b7a6-416f-876b-226b2b5ab07b",
     "versionId": "0.1",
+    "enableNestedChildren": false,
     "exampleLabelObject": {
       "text": "whats the weather in buenos aires?",
       "intentName": "WeatherInPlace",
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulBatchAddLabelsRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulBatchAddLabelsRequest.json
index bc2a357b807a..516369be8a7c 100644
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulBatchAddLabelsRequest.json
+++ b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulBatchAddLabelsRequest.json
@@ -4,6 +4,7 @@
     "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
     "appId": "2370fb9d-7dbc-4898-a361-a742cf290766",
     "versionId": "0.1",
+    "enableNestedChildren": false,
     "exampleLabelObjectArray": [
       {
         "text": "whats the weather in seattle?",
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulReviewLabeledExamplesRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulReviewLabeledExamplesRequest.json
index a0a43d373b31..49071d052202 100644
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulReviewLabeledExamplesRequest.json
+++ b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/examples/SuccessfulReviewLabeledExamplesRequest.json
@@ -3,7 +3,8 @@
     "Endpoint": "{Endpoint}",
     "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
     "appId": "86226c53-b7a6-416f-876b-226b2b5ab07b",
-    "versionId": "0.1"
+    "versionId": "0.1",
+    "enableNestedChildren": false
   },
   "responses": {
     "200": {
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetEntitySuggestionExamples.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetEntitySuggestionExamples.json
index 0c103cc44e24..f6605ccf44e3 100644
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetEntitySuggestionExamples.json
+++ b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetEntitySuggestionExamples.json
@@ -4,7 +4,8 @@
     "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
     "appId": "86226c53-b7a6-416f-876b-226b2b5ab07b",
     "versionId": "0.1",
-    "entityId": "3d73462d-98f0-4dcd-8d30-fab9e65f2e73"
+    "entityId": "3d73462d-98f0-4dcd-8d30-fab9e65f2e73",
+    "enableNestedChildren": false
   },
   "responses": {
     "200": {
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetIntentsSuggestionExamples.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetIntentsSuggestionExamples.json
index a0cd5f3a1bbc..260784bda5d1 100644
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetIntentsSuggestionExamples.json
+++ b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/model/SuccessfulGetIntentsSuggestionExamples.json
@@ -4,7 +4,8 @@
     "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
     "appId": "86226c53-b7a6-416f-876b-226b2b5ab07b",
     "versionId": "0.1",
-    "intentId": "3d73462d-98f0-4dcd-8d30-fab9e65f2e73"
+    "intentId": "3d73462d-98f0-4dcd-8d30-fab9e65f2e73",
+    "enableNestedChildren": false
   },
   "responses": {
     "200": {
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulAddUserToAccessListRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulAddUserToAccessListRequest.json
deleted file mode 100644
index 868818ea0bda..000000000000
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulAddUserToAccessListRequest.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "parameters": {
-    "Endpoint": "{Endpoint}",
-    "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
-    "appId": "363187f1-c573-46b3-bc4c-ae01d686e68e",
-    "userToAdd": {
-      "email": "guest@outlook.com"
-    }
-  },
-  "responses": {
-    "200": {
-      "headers": {},
-      "body": {
-        "code": "Success",
-        "message": "Operation Successful"
-      }
-    }
-  }
-}
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulGetApplicationUserAccessListRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulGetApplicationUserAccessListRequest.json
deleted file mode 100644
index bca79c6b986c..000000000000
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulGetApplicationUserAccessListRequest.json
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "parameters": {
-    "Endpoint": "{Endpoint}",
-    "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
-    "appId": "363187f1-c573-46b3-bc4c-ae01d686e68e"
-  },
-  "responses": {
-    "200": {
-      "headers": {},
-      "body": {
-        "owner": "owner@email.com",
-        "emails": [
-          "yourname@outlook.com"
-        ]
-      }
-    }
-  }
-}
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulRemoveUserFromAccessListRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulRemoveUserFromAccessListRequest.json
deleted file mode 100644
index e07a94cd0393..000000000000
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulRemoveUserFromAccessListRequest.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "parameters": {
-    "Endpoint": "{Endpoint}",
-    "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
-    "appId": "363187f1-c573-46b3-bc4c-ae01d686e68e",
-    "userToDelete": {
-      "email": "guest@outlook.com"
-    }
-  },
-  "responses": {
-    "200": {
-      "headers": {},
-      "body": {
-        "code": "Success",
-        "message": "Operation Successful"
-      }
-    }
-  }
-}
diff --git a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulReplacesUsersFromAccessListRequest.json b/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulReplacesUsersFromAccessListRequest.json
deleted file mode 100644
index 34444826b73b..000000000000
--- a/specification/cognitiveservices/data-plane/LUIS/Authoring/preview/v3.0/examples/permissions/SuccessfulReplacesUsersFromAccessListRequest.json
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-  "parameters": {
-    "Endpoint": "{Endpoint}",
-    "Ocp-Apim-Subscription-Key": "00000000000000000000000000000000",
-    "appId": "363187f1-c573-46b3-bc4c-ae01d686e68e",
-    "collaborators": {
-      "emails": [
-        "guest@outlook.com",
-        "invited.user@live.com"
-      ]
-    }
-  },
-  "responses": {
-    "200": {
-      "headers": {},
-      "body": {
-        "code": "Success",
-        "message": "Operation Successful"
-      }
-    }
-  }
-}