The below PowerShell script will Add an Active Directory Domain Group to Computer Local Remote Desktop Users Group.

#!powershell

# Setup Key Values
###################################
$GrouptoAdd = “YourGroupName”

# Adding Domain Group to Remote Desktop Users Group
####################################################
write-host ” ”
write-host “Adding Domain Group $GrouptoAdd to Remote Desktop Users Group” -ForegroundColor Yellow
write-host ” “

$GroupObj = [ADSI]”WinNT://localhost/Remote Desktop Users”
$GroupObj.Add(“WinNT://knowledgeascent.com/$GrouptoAdd”)