Is there a way to lock a group of objects?

 From:  ed (EDDYF)
7334.1 
I have four wheels, each made up of a rim, spokes and tire. Each component assigned a unique Style.

In my bumbling ways of making selections, I often knock one part away from the others. So, is there a way to lock these parts together such that I can move the entire wheel around, but the assembly always remains together?

Ed Ferguson