WSUS Updating-Add Computer Groups to AD

Just installed WSUS to a Windows 2000 Server platform. WSUS has been synchronized with Windows Update and is the only WSUS server on the network(No mirroring). I have created a computer group in the WSUS admin GUI webpage- http://servername/WSUSAdmin …. The computers that are in Active Directory need to be put in this group ….I’ve learned from Technet session on WSUS that computer groups should be precreated for WSUS…
using a group policy object linked to an active directory container appropriate for my enviroment…my OU’s have to be linked to my GPO’s…
How do I do this in a windows 2000 server running Active directory to install WSUS as a network service?