CST - Is it possible to use more than 1 plane wave?

Hi all,
Is it possible in CST to use more than only 1 plane wave to illuminate objects.
I have a square dielectric and I want to illuminate from 2 or 3 sides with plane waves to see how the E-fields add up.
When I use 1 plane wave, CST only gives me the option of "Edit plane wave"
thanks ya all.

Noone really?