ok, I guess I am missing something but... I have a standard

ok, I guess I am missing something but...

I have a standard multi site setup, with pro sites and membership "co-habitating" nicely.

My question is, I don't want the sub sites to have access to the membership plugin,

Is it it possible to set up a additional "level" in pro sites and manually assign the main site to it and give it access to the membership plugin? but not make the additional level viewable to the subsites?

my end goal is to not give access to or let subsites even know about the membership plugin at all.

Thanks in advance
Trevor