Could the users join into two levels at same time

Hello,

I use pro sites plugin as below:

1. I create three levels at same price. Level A users could use theme A, Level B users could use theme B.......

2. In fact, the levels are flat , each level users use their themes.

If a user want to use theme A and B, are there some way to make the user join into level A and B at same time?

Hope to get some advice. Thanks.