I am trying to create a shape that is a rectangle with rounded corners with lots of holes cut into it. The rectangle is 14 x 12 and the holes (circles) are in a 26 x 23 grid, so 138 holes in all. When I select the rectangle and the grid of holes and click on the Subtract operation, I get a progress popup that counts up to almost 600, then the error message saying that the shape is too complex.

Is there some way I can make this work? I could reduce the number of holes, but I'd rather not.

Why is it counting up to 600. There are only 139 shapes, 138 circles and one rectangle?

Correction: 26x23 = 598 (not 138). Not sure what I was thinking.