Prosites / WHMCS configuration

I'm setting up a new site to handle some of my client sites and I was looking at Prosites and WHMCS to streamline some of it. I can't figure out how to set up plugin packages.

I want 1 package to have plugins A and B.
I want package 2 to have B and C.
And I want package 3 to have A and C.

Is that possible or are we stuck with a linear access progression?

Thanks for the help,