diff --git a/scripts/create-net6-preview-flow.ps1 b/scripts/create-net6-preview-flow.ps1
index d67150a11d7..c5a25d9f562 100644
--- a/scripts/create-net6-preview-flow.ps1
+++ b/scripts/create-net6-preview-flow.ps1
@@ -4,7 +4,10 @@ param
     [Parameter(Mandatory=$true)][string]$SdkChannel,
     [Parameter(Mandatory=$true)][string]$RuntimeBranch,
     [Parameter(Mandatory=$true)][string]$SdkBranch,
-    [Parameter(Mandatory=$true)][string]$VSChannel
+    [Parameter(Mandatory=$true)][string]$VSChannel,
+    [switch]$AddInternalFlow,
+    [string]$InternalRuntimeChannel,
+    [string]$InternalSdkChannel
 )
 
 function MakeDefaultChannel($repo, $branch, $channel)
@@ -13,18 +16,37 @@ function MakeDefaultChannel($repo, $branch, $channel)
     & darc add-default-channel --repo "$repo" --branch "$branch" --channel "$channel" --quiet
 }
 
+function DisableFlow($channel)
+{
+    Write-Host "Disabling flow on $channel"
+    & darc subscription-status --disable --channel "$channel" --quiet --exact
+}
+
 function AddFlow($sourceRepo, $sourceChannel, $targetRepo, $targetBranch, $frequency)
 {
     Write-Host "Adding flow - $sourceRepo @ $sourceChannel -> $targetRepo @ $targetBranch ($frequency)"
     & darc add-subscription --source-repo "$sourceRepo" --channel "$sourceChannel" --target-repo "$targetRepo" --target-branch "$targetBranch" --update-frequency "$frequency" --quiet --no-trigger --standard-automerge
 }
 
+function AddBatchedFlow($sourceRepo, $sourceChannel, $targetRepo, $targetBranch, $frequency)
+{
+    Write-Host "Adding flow - $sourceRepo @ $sourceChannel -> $targetRepo @ $targetBranch ($frequency)"
+    & darc add-subscription --source-repo "$sourceRepo" --channel "$sourceChannel" --target-repo "$targetRepo" --target-branch "$targetBranch" --update-frequency "$frequency" --quiet --no-trigger --batchable
+}
+
+function AddBatchedMergePolicy($targetRepo, $targetBranch)
+{
+    Write-Host "Setting batched merge policy for $targetRepo @ $targetBranch"
+    & darc set-repository-policies --repo "$targetRepo" --branch "$targetBranch" --standard-automerge --quiet
+}
+
 function AddArcadeFlow($targetRepo, $targetBranch)
 {
     AddFlow https://github.com/dotnet/arcade ".NET Eng - Latest" $targetRepo $targetBranch None
 }
 
-# Make default channels
+$InternalRuntimeBranch = "internal/$RuntimeBranch"
+$InternalSdkBranch = "internal/$SdkBranch"
 
 Write-Host "Making default channels for runtime repos"
 MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int $RuntimeBranch $RuntimeChannel
@@ -38,15 +60,42 @@ MakeDefaultChannel https://github.com/dotnet/wpf $RuntimeBranch $RuntimeChannel
 MakeDefaultChannel https://github.com/dotnet/winforms $RuntimeBranch $RuntimeChannel
 MakeDefaultChannel https://github.com/mono/linker $RuntimeBranch $RuntimeChannel
 
+if ($AddInternalFlow) {
+    # Because of where internal fixes tend to be, we eliminate some leaves in the graph
+    # and flow them through the normal public channels: emsdk, icu, linker.
+    # wpf-int gets assigned to the internal channel in addition (since there is no public->internal merge)
+    Write-Host "Making default channels for internal branches of runtime repos"
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int $RuntimeBranch $InternalRuntimeChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore $InternalRuntimeBranch $InternalRuntimeChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-efcore $InternalRuntimeBranch $InternalRuntimeChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-runtime $InternalRuntimeBranch $InternalRuntimeChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-windowsdesktop $InternalRuntimeBranch $InternalRuntimeChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-wpf $InternalRuntimeBranch $InternalRuntimeChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-winforms $InternalRuntimeBranch $InternalRuntimeChannel
+}
+
 Write-Host "Making default channels for SDK repos"
 MakeDefaultChannel https://github.com/dotnet/installer $SdkBranch $SdkChannel
 MakeDefaultChannel https://github.com/dotnet/sdk $SdkBranch $SdkChannel
 MakeDefaultChannel https://github.com/dotnet/roslyn-analyzers $SdkBranch $SdkChannel
 MakeDefaultChannel https://github.com/dotnet/templating $SdkBranch $SdkChannel
 
-# Make dependency flow
+if ($AddInternalFlow) {
+    # Because of where internal fixes tend to be, we eliminate some leaves in the sdk graph
+    # and flow them through the normal public channels: templating, roslyn-analyzers
+    Write-Host "Making default channels for SDK repos"
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-installer $InternalSdkBranch $InternalSdkChannel
+    MakeDefaultChannel https://dev.azure.com/dnceng/internal/_git/dotnet-sdk $InternalSdkBranch $InternalSdkChannel
+}
+
+Write-Host "Setting up batched merge policies"
+AddBatchedMergePolicy https://github.com/dotnet/aspnetcore $RuntimeBranch
 
-Write-Host "Add arcade flow"
+if ($AddInternalFlow) {
+    AddBatchedMergePolicy https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore $InternalRuntimeBranch
+}
+
+Write-Host "Adding arcade flow"
 AddArcadeFlow https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int $RuntimeBranch
 AddArcadeFlow https://github.com/dotnet/aspnetcore $RuntimeBranch
 AddArcadeFlow https://github.com/dotnet/efcore $RuntimeBranch
@@ -62,31 +111,64 @@ AddArcadeFlow https://github.com/dotnet/sdk $SdkBranch
 AddArcadeFlow https://github.com/dotnet/roslyn-analyzers $SdkBranch
 AddArcadeFlow https://github.com/dotnet/templating $SdkBranch
 
-Write-Host "Add runtime -> runtime flow"
+Write-Host "Adding runtime -> runtime flow"
 AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int $RuntimeChannel https://github.com/dotnet/wpf $RuntimeBranch EveryBuild
-AddFlow https://github.com/dotnet/efcore $RuntimeChannel https://github.com/dotnet/aspnetcore $RuntimeBranch EveryBuild
-AddFlow https://github.com/dotnet/emsdk $RuntimeChannel https://github.com/dotnet/aspnetcore $RuntimeBranch EveryBuild
+AddBatchedFlow https://github.com/dotnet/efcore $RuntimeChannel https://github.com/dotnet/aspnetcore $RuntimeBranch EveryBuild
+AddBatchedFlow https://github.com/dotnet/emsdk $RuntimeChannel https://github.com/dotnet/aspnetcore $RuntimeBranch EveryBuild
 AddFlow https://github.com/dotnet/emsdk $RuntimeChannel https://github.com/dotnet/runtime $RuntimeBranch EveryBuild
 AddFlow https://github.com/dotnet/icu $RuntimeChannel https://github.com/dotnet/runtime $RuntimeBranch EveryBuild
-AddFlow https://github.com/dotnet/runtime $RuntimeChannel https://github.com/dotnet/aspnetcore $RuntimeBranch EveryBuild
+AddBatchedFlow https://github.com/dotnet/runtime $RuntimeChannel https://github.com/dotnet/aspnetcore $RuntimeBranch EveryBuild
 AddFlow https://github.com/dotnet/runtime $RuntimeChannel https://github.com/dotnet/efcore $RuntimeBranch EveryBuild
 AddFlow https://github.com/dotnet/runtime $RuntimeChannel https://github.com/dotnet/winforms $RuntimeBranch EveryBuild
 AddFlow https://github.com/dotnet/winforms $RuntimeChannel https://github.com/dotnet/wpf $RuntimeBranch EveryBuild
 AddFlow https://github.com/dotnet/wpf $RuntimeChannel https://github.com/dotnet/windowsdesktop $RuntimeBranch EveryBuild
 AddFlow https://github.com/mono/linker $RuntimeChannel https://github.com/dotnet/runtime $RuntimeBranch EveryBuild
 
+if ($AddInternalFlow) {
+    Write-Host "Adding internal runtime -> internal runtime flow"
+    AddBatchedFlow https://dev.azure.com/dnceng/internal/_git/dotnet-efcore $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore $InternalRuntimeBranch EveryBuild
+    AddBatchedFlow https://dev.azure.com/dnceng/internal/_git/dotnet-runtime $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore $InternalRuntimeBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-wpf $InternalRuntimeBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-runtime $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-efcore $InternalRuntimeBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-runtime $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-winforms $InternalRuntimeBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-winforms $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-wpf $InternalRuntimeBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-wpf $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-windowsdesktop $InternalRuntimeBranch EveryBuild
+    
+    Write-Host "Disabling internal runtime -> internal runtime flow"
+    DisableFlow $InternalRuntimeChannel
+}
+
 Write-Host "Add runtime->sdk flow"
 AddFlow https://github.com/dotnet/aspnetcore $RuntimeChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 AddFlow https://github.com/dotnet/windowsdesktop $RuntimeChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 AddFlow https://github.com/dotnet/runtime $RuntimeChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 AddFlow https://github.com/mono/linker $RuntimeChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 
+if ($AddInternalFlow) {
+    Write-Host "Adding internal runtime->internal sdk flow"
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-sdk $InternalSdkBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-windowsdesktop $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-sdk $InternalSdkBranch EveryBuild
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-runtime $InternalRuntimeChannel https://dev.azure.com/dnceng/internal/_git/dotnet-sdk $InternalSdkBranch EveryBuild
+    
+    Write-Host "Disabling internal runtime->internal sdk flow"
+    DisableFlow $InternalRuntimeChannel
+}
+
 Write-Host "Add sdk->sdk flow"
 AddFlow https://github.com/dotnet/sdk $SdkChannel https://github.com/dotnet/installer $SdkBranch EveryBuild
 AddFlow https://github.com/dotnet/roslyn-analyzers $SdkChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 AddFlow https://github.com/dotnet/templating $SdkChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 
-Write-Host "Add tooling->sdk flow"
+if ($AddInternalFlow) {
+    Write-Host "Adding internal sdk->internal sdk flow"
+    # Nothing but SDK->installer flows internally
+    AddFlow https://dev.azure.com/dnceng/internal/_git/dotnet-sdk $InternalSdkChannel https://dev.azure.com/dnceng/internal/_git/dotnet-installer $InternalSdkBranch EveryBuild
+    
+    Write-Host "Disabling internal sdk->internal sdk flow"
+    DisableFlow $InternalSdkChannel
+}
+
+Write-Host "Adding tooling->sdk flow"
 AddFlow https://github.com/nuget/nuget.client $VSChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 AddFlow https://github.com/dotnet/roslyn $VSChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
 AddFlow https://github.com/dotnet/fsharp $VSChannel https://github.com/dotnet/sdk $SdkBranch EveryBuild
diff --git a/scripts/flip-previewplus-flow.ps1 b/scripts/flip-previewplus-flow.ps1
new file mode 100644
index 00000000000..00ab240dd8f
--- /dev/null
+++ b/scripts/flip-previewplus-flow.ps1
@@ -0,0 +1,50 @@
+param
+(
+    [Parameter(Mandatory=$true)][string]"$RuntimeChannel",
+    [Parameter(Mandatory=$true)][string]"$SdkChannel",
+    [Parameter(Mandatory=$true)][string]"$InternalRuntimeChannel",
+    [Parameter(Mandatory=$true)][string]"$InternalSdkChannel",
+    [Parameter(Mandatory=$true)][ValidateSet('Preview','Preview+')][string]$FlowType,
+    [switch]$TriggerSubscriptions
+)
+
+Write-Host "Switching flow to $FlowType"
+
+switch ( $FlowType )
+{
+    'Preview' {
+        # Switching to public flow is easy. Enable all the subscriptions in the public runtime and SDK channels
+        # and disable any on the internal channels
+        & darc subscription-status --disable --channel "$InternalRuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --channel "$InternalSdkChannel" --quiet --exact
+        & darc subscription-status --enable --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --enable --channel "$SdkChannel" --quiet --exact
+
+        # Trigger public subscriptions
+        if ($TriggerSubscriptions) {
+            & darc trigger-subscriptions --channel "$RuntimeChannel" --quiet --exact
+            & darc trigger-subscriptions --channel "$SdkChannel" --quiet --exact
+        }
+    }
+    'Preview+' {
+        # Switching to internal flow is a little more subtle. Enable the internal subscriptions,
+        # then disable the corresponding public subscriptions, which is a subset of the full public channel
+        & darc subscription-status --enable --channel "$InternalRuntimeChannel" --quiet --exact
+        & darc subscription-status --enable --channel "$InternalSdkChannel" --quiet --exact
+
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/runtime --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/winforms --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/wpf --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/windowsdesktop --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/aspnetcore --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/efcore --channel "$RuntimeChannel" --quiet --exact
+        & darc subscription-status --disable --source-repo https://github.com/dotnet/sdk --channel "$SdkChannel" --quiet --exact
+
+        # Trigger internal subscriptions
+        if ($TriggerSubscriptions) {
+            & darc trigger-subscriptions --channel "$InternalRuntimeChannel" --quiet --exact
+            & darc trigger-subscriptions --channel "$InternalSdkChannel" --quiet --exact
+        }
+    }
+    default { Write-Error "Unknown flow type $FlowType" }
+}
\ No newline at end of file