Tom,
The problem is that once I put the fill in place, the lines behind it won't disappear in section. As I said, I can use fills as masks just fine in plan, but in section the target lines remain visible.
I keep thinking that it is a view depth issue, but I have tried changing the view depth with no luck. Empty fill, solid fill, transparent background, window color background, display options....nothing seems to work in section.
Perhaps a step-by-step listing of the proper settings would help.
Gary Bley