Adding Tiered Levels of Access

Hello -

I recently just purchased Membership and have a quick question. I have four types of content:

- Category A
- Category B
- Category C
- Category D

So, I create four different access levels:

----------
Category A Scholar
-----------
Postive: A
Negative: B,C,D

(repeat for the other categories)

But, some users need to have access to Categories A and B. With the method I showed above, the Negative rules override the Postive Rules (thus, not showing any content at all). Is it possible to do this type of tiered access without having the create Access Levels for each possible outcome?

Thanks!
Chris