Cannot access the server but it is detected

I have a server set up with Mac X Operating System. The clients that are bound to the domain appear in the “Computers” workgroup.
However, I cannot see the server in the said group. I did try to add the server to this group but there was an error message saying that there was already a computer with the same name in it. I decided to create a new group to where I can add the server to.
Can you help me figure out how to view the server and add it to the newly created workgroup? Thanks!
