diff --git a/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_createOrUpdate.json b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_createOrUpdate.json
new file mode 100644
index 000000000000..888e51feab3e
--- /dev/null
+++ b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_createOrUpdate.json
@@ -0,0 +1,39 @@
+{
+  "parameters": {
+    "Endpoint": "{Endpoint}",
+    "collection": "ExampleCollection",
+    "api-version": "2021-09-01",
+    "entity": {
+      "referredEntities": {},
+      "entity": {
+        "typeName": "azure_storage_account",
+        "attributes": {
+          "name": "exampleaccount",
+          "qualifiedName": "https://exampleaccount.core.windows.net"
+        }
+      }
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "mutatedEntities": {
+          "CREATE": [
+            {
+              "typeName": "azure_storage_account",
+              "attributes": {
+                "qualifiedName": "https://exampleaccount.core.windows.net"
+              },
+              "lastModifiedTS": "1",
+              "guid": "38d3c41f-300c-434e-8dad-0b1a7cb5efd6",
+              "status": "ACTIVE"
+            }
+          ]
+        },
+        "guidAssignments": {
+          "-9514774903018162": "38d3c41f-300c-434e-8dad-0b1a7cb5efd6"
+        }
+      }
+    }
+  }
+}
diff --git a/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_createOrUpdateBulk.json b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_createOrUpdateBulk.json
new file mode 100644
index 000000000000..3279bfbf0238
--- /dev/null
+++ b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_createOrUpdateBulk.json
@@ -0,0 +1,61 @@
+{
+  "parameters": {
+    "Endpoint": "{Endpoint}",
+    "collection": "ExampleCollection",
+    "api-version": "2021-09-01",
+    "entities": {
+      "referredEntities": {},
+      "entities": [
+        {
+          "typeName": "azure_storage_account",
+          "attributes": {
+            "qualifiedName": "exampleaccount",
+            "name": "exampleaccount",
+            "description": "Example Description"
+          }
+        },
+        {
+          "typeName": "azure_storage_account",
+          "attributes": {
+            "qualifiedName": "exampleaccount2",
+            "name": "exampleaccount2"
+          }
+        }
+      ]
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "mutatedEntities": {
+          "UPDATE": [
+            {
+              "typeName": "azure_storage_account",
+              "attributes": {
+                "qualifiedName": "exampleaccount"
+              },
+              "lastModifiedTS": "2",
+              "guid": "b2f9c306-cf65-4bb0-878e-cfaafde156b1",
+              "status": "ACTIVE"
+            }
+          ],
+          "CREATE": [
+            {
+              "typeName": "azure_storage_account",
+              "attributes": {
+                "qualifiedName": "exampleaccount2"
+              },
+              "lastModifiedTS": "1",
+              "guid": "321493e3-3fb7-4b3e-9df7-3b69154174c2",
+              "status": "ACTIVE"
+            }
+          ]
+        },
+        "guidAssignments": {
+          "-9514774903018192": "321493e3-3fb7-4b3e-9df7-3b69154174c2",
+          "-9514774903018193": "b2f9c306-cf65-4bb0-878e-cfaafde156b1"
+        }
+      }
+    }
+  }
+}
diff --git a/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_moveEntitiesToCollection.json b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_moveEntitiesToCollection.json
new file mode 100644
index 000000000000..bc9c78428ab4
--- /dev/null
+++ b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/examples/CatalogCollection_moveEntitiesToCollection.json
@@ -0,0 +1,45 @@
+{
+  "parameters": {
+    "Endpoint": "{Endpoint}",
+    "collection": "ExampleNewCollection",
+    "api-version": "2021-09-01",
+    "moveEntitiesRequest": {
+      "entityGuids": [
+        "321493e3-3fb7-4b3e-9df7-3b69154174c2",
+        "b2f9c306-cf65-4bb0-878e-cfaafde156b1"
+      ]
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "mutatedEntities": {
+          "UPDATE": [
+            {
+              "typeName": "azure_storage_account",
+              "attributes": {
+                "qualifiedName": "exampleaccount"
+              },
+              "lastModifiedTS": "3",
+              "guid": "b2f9c306-cf65-4bb0-878e-cfaafde156b1",
+              "status": "ACTIVE"
+            },
+            {
+              "typeName": "azure_storage_account",
+              "attributes": {
+                "qualifiedName": "exampleaccount2"
+              },
+              "lastModifiedTS": "2",
+              "guid": "321493e3-3fb7-4b3e-9df7-3b69154174c2",
+              "status": "ACTIVE"
+            }
+          ]
+        },
+        "guidAssignments": {
+          "-9514774903018192": "321493e3-3fb7-4b3e-9df7-3b69154174c2",
+          "-9514774903018193": "b2f9c306-cf65-4bb0-878e-cfaafde156b1"
+        }
+      }
+    }
+  }
+}
diff --git a/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/purviewcatalog.json b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/purviewcatalog.json
index e8387dc7be17..f281866cf52f 100644
--- a/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/purviewcatalog.json
+++ b/specification/purview/data-plane/Azure.Analytics.Purview.Catalog/preview/2021-09-01/purviewcatalog.json
@@ -3558,6 +3558,141 @@
           }
         }
       }
+    },
+    "/collections/{collection}/entity": {
+      "post": {
+        "tags": [
+          "CatalogCollection"
+        ],
+        "description": "Creates or updates an entity to a collection.\nExisting entity is matched using its unique guid if supplied or by its unique attributes eg: qualifiedName.\nMap and array of collections are not well supported. E.g., array<array<int>>, array<map<string, int>>.",
+        "operationId": "CatalogCollection_createOrUpdate",
+        "x-ms-examples": {
+          "CatalogCollection_createOrUpdate": {
+            "$ref": "./examples/CatalogCollection_createOrUpdate.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/collection"
+          },
+          {
+            "$ref": "#/parameters/purviewAPIVersion"
+          },
+          {
+            "in": "body",
+            "name": "entity",
+            "description": "Atlas entity with extended information.",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/AtlasEntityWithExtInfo"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Created with EntityMutationResponse.",
+            "schema": {
+              "$ref": "#/definitions/EntityMutationResponse"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
+    "/collections/{collection}/entity/bulk": {
+      "post": {
+        "tags": [
+          "CatalogCollection"
+        ],
+        "description": "Creates or updates entities in bulk to a collection.\nExisting entity is matched using its unique guid if supplied or by its unique attributes eg: qualifiedName.\nMap and array of collections are not well supported. E.g., array<array<int>>, array<map<string, int>>.",
+        "operationId": "CatalogCollection_createOrUpdateBulk",
+        "x-ms-examples": {
+          "CatalogCollection_createOrUpdateBulk": {
+            "$ref": "./examples/CatalogCollection_createOrUpdateBulk.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/collection"
+          },
+          {
+            "$ref": "#/parameters/purviewAPIVersion"
+          },
+          {
+            "in": "body",
+            "name": "entities",
+            "description": "Atlas entities with extended information.",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/AtlasEntitiesWithExtInfo"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Created with EntityMutationResponse.",
+            "schema": {
+              "$ref": "#/definitions/EntityMutationResponse"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
+    "/collections/{collection}/entity/moveHere": {
+      "post": {
+        "tags": [
+          "CatalogCollection"
+        ],
+        "description": "Move existing entities to the target collection.",
+        "operationId": "CatalogCollection_moveEntitiesToCollection",
+        "x-ms-examples": {
+          "CatalogCollection_moveEntitiesToCollection": {
+            "$ref": "./examples/CatalogCollection_moveEntitiesToCollection.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/collection"
+          },
+          {
+            "$ref": "#/parameters/purviewAPIVersion"
+          },
+          {
+            "in": "body",
+            "name": "moveEntitiesRequest",
+            "description": "Entity guids to be moved to target collection.",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/MoveEntitiesRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Created with EntityMutationResponse.",
+            "schema": {
+              "$ref": "#/definitions/EntityMutationResponse"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
     }
   },
   "definitions": {
@@ -5189,6 +5324,18 @@
       "title": "ClassificationAssociateRequest",
       "description": "The request for classification association."
     },
+    "MoveEntitiesRequest": {
+      "type": "object",
+      "properties": {
+        "entityGuids": {
+          "type": "array",
+          "description": "An array of entity guids to be moved to target collection.",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
     "DateFormat": {
       "type": "object",
       "title": "DateFormat",
@@ -6675,6 +6822,14 @@
         "modelAsString": true
       },
       "x-ms-parameter-location": "method"
+    },
+    "collection": {
+      "name": "collection",
+      "description": "the collection unique name",
+      "in": "path",
+      "required": true,
+      "type": "string",
+      "x-ms-parameter-location": "method"
     }
   }
 }