you can use following code to create groups on PCs

code:

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;Create Group
$oComputer=GetObject("WinNT://Computername,computer") ;Replace the computername with your real pc name 
$oGroup=$oComputer.Create("group","Groupname")
$oGroup.Put("grouptype",4) ;2=global(in domain) and 4=lokal
$oGroup.setinfo
;Add Users
$oGroup.add("WinNT://Domain/Username")

;show group members
for each $e in $oGroup.members
 ? $e.name
next

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I hope it helps