Delete all of the seats and the back faces of the stands, until you're left with just the faces on each row. This will be used to define the area people might be standing. |
Repeat that for the remaining stands. |
This should be roughly what you see. Make the selected faces into a group, and then make all of the cutouts into a group. |
Copy and paste the cutouts group back over the top of the stand. Open it and delete all of the cutouts situated over the top of the aisles. |
Finished. As you can see, the process is rough, but it accomplishes the end result quickly. |