My other issue with this task is that when I choose the fill style as a pattern in the attributes palette, (with the rectangle representing the proscenium arch selected), the fill defaults back to no fill. So I can't seem to fill the top rectangle with a hatch from the pattern option in attributes.
I have had success in changing the fill if the rectangle is the only object in view. I'd click or maybe double click the rectangle and I would get a new view with only the rectangle on a layer called "proscenium", a layer I have not made up. Once the change had been made, I can click on the layer called theatre floor plan to see the rectangle in place with the hatch pattern I chose. At this point I am back to my original problem whereby both the original and the duplicate have the same fill.
Al Fitch