I want to analisy the contact between two tooth in a gear theet.

Well,  I really need to analize the contact in the 6 tooth that are really working, but I don't wont to spend memory and CPU meshing all the gear theet just to see they have no stress.

In other words, is it possible to  " cut" the piece and reduce the analisys only to the interesting part, inside the red line?

Of course, I don't want to make two new drawings.