ADMX files are a .xml representation of the Windows Registry, copying these files to the 'PolicyDefinition' folder of the local client expands GPO Editor for additional products and services. In a Domain admx files are copied to the 'Central Store', with a standalone its 'C:\Windows\PolicyDefinitions' folder.
In this example, MS Edge and Google's Chrome admx files will be copied to the local client during deployment from MDT.
Download and unzip the polices files for Edge and Chrome.
https://www.microsoft.com/en-us/edge/business/download
https://cloud.google.com/chrome-enterprise/browser/download
Not all the files are required, select en-US and any additional language folders for both adml and admx. Create a folder for each application, a sub-folder for admx and adml, and move the relevant files to the corresponding folder. Finally copy the entire content to the 'Scripts\Custom\' folder under the MDT Deployment Share.
<#
.Synopsis
Copy ADMX files to local client store
.Description
.Version
#>
#Source folder for content
$path = Split-Path -Parent $myInvocation.MyCommand.path
#admx and adml destination folder
$admX = "C:\Windows\PolicyDefinitions"
$admL = "C:\Windows\PolicyDefinitions\en-us"
#Source plus product specific admx and adml files
#Edge
$edgeL = $path + "\Edge\adml\*"
$edgeX = $path + "\Edge\admx\*"
#Chrome
$chromeL = $path + "\Chrome\adml\*"
$chromeX = $path + "\Chrome\admx\*"
#Copies polices to Policy Definition folder
Copy-item $edgeX $admX -Exclude *.ps1 -Force -recurse -Verbose -ErrorAction SilentlyContinue
Copy-item $edgeL $admL -Exclude *.ps1 -Force -recurse -Verbose -ErrorAction SilentlyContinue
Copy-item $chromeX $admX -Exclude *.ps1 -Force -recurse -Verbose -ErrorAction SilentlyContinue
Copy-item $chromeL $admL -Exclude *.ps1 -Force -recurse -Verbose -ErrorAction SilentlyContinue
Save the script to the root of the ADMX folder
Update the MDT client Task Sequence and add a PowerShell script step