How to create “subdomain” in an Win2kpro

Dear Friends,

I have a NT 4.0 sp6 PDC and Win 2k pro desktops. Some groups of these desktops are situated in certain envirorments I would like to be kind of a subnet, as I had when the desktops were Win98. However in the Windows 2000 pro if I putthe desktop member of a group I cannot log as a network or domain user. How do I create the equivalent “subnet” I had when the desktops were Win 98 now using Win2k pro in a single domain network.

Thanks
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Paulo