Domain user setup question

Hi. We have a Windows 2000 Server running Active Directory and have all the users setup in Users and Computers.

The workstations are all Windows 2000 Pro or XP Pro. The users can log on to the domain on the workstations but they have permission issues unless you go into User Accounts in the Control Panel and add each user account locally.

So for example, if you have 10 users that share the same workstation, you have to go into User Accounts on the workstation, click on “add” and choose their domain username and their domain. You end up doing this for all 10 users. Is there an easier way then having to go to each computer and add each domain user who might logon at that computer?