Multiple Samba domains

Hello everyone

I have a problem,

I work in a company with 50 P.C. organized in 5 workgroups with Windows 98, 2000, NT, XP Workstations.

I want to place this 50 P.C. , using Samba from Linux, in 5 Samba domains on a single linux machine.

I’ ve made a Samba PDC, but i didn’t succed to make another domain on the same machine.

There is anybody ho can help me ( example, configuration).

Thank you very much!!!