I don't think what you are trying to do is possible from windows but i think that there are applications that will let you do this. Why not join all pc's to the domain and then upgrade?
Slán
~M
>Dear all,
>In Windows 2000 Domain environment, I found I can't join my
>PC to both Domain and Workgroup at the same time. If I join
>the domain, the workgroup can't find my PC and vice-versa.
>How can I join both? My company has over 100 workstations and
>plan to upgrade all to Windows 2000 Professional. I need to
>group the computers by departments for easier management
>because there are too many workstations appear in one Domain.
>But there is no problem in doing so for Windows 9X/ME.
>
>Thanks for any help.