I'm need a hand with something.

I have the following setup:

Admin Group A (located in Texas)
  Server A

Admin Group B (located in Alabama)
  Server B

All connectors and associated connections all work perfect.

I need to replace Server B with another server because it's running out of
HD space on the entire server.

So, what I'd like to do is crate Admin Group C and place the server from A
and the newly created server (C) into group C.   The reason for Group C is
that A and B are labled for old domains that no longer have computers in
them, but the domain will not go away (when you browse the network I still
see the old domains listed and I found out it's because of where the Exchange
server are listed in Exchange Manager - I know, it doesn't make sense to me
either).  I figure creating Group C with the corresponding domain name and
moving both Exchange Servers into it will fix my problems.  

Am I able to do this?  If so, how do I move Server A into Group C, I cannot
figure it out.

Mike