Grouping computers on domain like wrkgrp

I have setup a Active Directory for my computers. Prior to that its been working on a workgroup. Eg. Sales, Finance, HR, etc.

Now that I have my active directory, i tried to join my clients on the domain, but i have a little problem, they belong to one workgroup now (the netbios name of my domain).

Is there a way to group them like workgroupings before?

thank you