Parent/Child and nested children

I would like to create a true parent/child setup for our nodes.  In Groups, group management, I see "telecom" as a parent.  The I have a few children under it. I want to add children to the existing children, and possibly more children under those.  However If I do this with groups, the ALL the groups show up in the main group management tab. I think the Group idea works differently than a true Parent.Child relationship.

Here is what im trying to do:

*Telecom Group

     -Amherst Junction Tower router (parent)

               > AMI Router (child)

                         >AMI TGB (child children)

                         >AMI Relay (child children)

               >Radio System router (child)

               >SCADA Router (child)

                         >Serial server (child children)

     -Beaver Dam Tower Router

               >AMI Router

                         >AMI TGB

                         >AMI Relay

               >Radio System router

                >SCADA router

                         >Serial Server

etc.

Can anyone help describe how to set this up without congesting the main Groups screen?

Thanks

NH