[Kazun]

Код:

Get-ADUser -Filter {department -like '*'} -SearchBase "OU=MyOY,DC=Contoso,DC=Com" | Group-Object Department | Foreach {
	$gr = Get-ADGroup -Filter "Name -eq '$($_.Name)'"
	if($gr) {Add-ADGroupMember -Identity $gr  -Members $_.Group}
}