Ability to Create Subgroups under groups on the Computers Page

The ability to create subgroups on the computer page would be very helpful.  In my case, we organize all of our PCs under groups labeled by Warehouse number, but we need the ability to create subgroups that would allow us to further organize those PCs into departments or locations within those warehouses.

Here is an example:

Warehouse 01 >

        Sales>

                     PC1

                     PC2 .....etc..

        Accounting>

                      PC3

                      PC4  ......etc..