Yo Bob
If you put your submaster into your master, then the submaster is “live” and if you make changes to that sub, the changes will flow to all instances in your master.
If you want to edit them as separate entities, when you add the submaster to the master you need to hold down the command key, and the result will be that the clips that make up the sub will appear in the master, adn you can change them independently.
Your pal,
Ross Cibella