Resource Hierarchy -- should I use groups?

[mystuff]

I have a question on how to design my resources. Our company has a hierarchy that goes something like this:

TOWER
DOMAIN
BUSINESS FUNCTION
TEAM
BAY

Instead of assigning "people" to each task/project on my Gantt Chart, I want to assign "bays" (so a bay can be thought of like a person). How do I set this up so I can report at anyone of the hierarchy levels shown above? I know in the Resource Sheet, I can assign a bay to a "group" but is their a way to set up groups as a hierarchy as shown above?

Thanks.