is there inheritance in Project Access

We are using Primavera P6 v8.1

In User Access-->Project Access, I have assigned the top-level "Responsible Manager" to a couple of P6 users with the assumption that they would be able to access this manager's projects, as well as the projects of all persons who report to the manager.  This seems to *not* be the case - the P6 users are able to access the projects of only the top-level Responsible Manager, but none of the lower level managers.  Is this how P6 is supposed to work?  Is there a way to turn on inheritance?

In the meantime, as a workaround I have expanded the "Responsible Manager" tree and individually assigned every manager to these P6 users, which works but is really cumbersome since our management tree is pretty big.