Add Users to Local Group
From nswccWiki
There are two ways to add a domain group to a local admin group.
First it is best to create a global domain group you can use, rather than putting in individual users. e.g. LocalAdmins, LocalPowerUsers
The 1st way is easiest, but you can only add admin, you can not add Power Users.
Create a new group policy in GPMC, eg WS LocalRights.
Now in new policy expand
Computer Configuration Windows Settings Security Settings Restricted Groups
Right Click and Add Group and paste BUILTIN\Administrators
Then add members:
DomainName\LocalAdmins, DomainName\Enterprise Admins, DomainName\Domain Admins, DomainName\Desktop Admins, etc.
Then assign this to the OU where your workstations are.
To add Power Users you need to use the new GPMC console and Group Policy Preferences, which are only available in Vista or Server 2008.
Use can use a Computer Configuration Preference item to add a Domain Group to the local Power Users group.
