pricing - condition types and req.

I have two condition types. Only the condition type A has a access sequence assigned. In the pricing procedure, the condition type A has only the Reqt 2 assigned. C.t. B has a requirement and a calculation type assigned.

What i want: for a certain scenario the condition type A should be calculated as condition type B is calculated and to ignore the condition records found. Is it possible? How can i do that? It's enough if i create a requirement for A as a copy from B and assign it?

A is upper in the pricing procedure than B.

Thanks