I want to be able to snap to any part of my Corridor model and the Z will pick up only the top surface. I have unchecked some of the feature lines under the "Feature Lines" tab in the Corridor Properties such as ETW_SubBase & EPS_Sub which appear to be subgrade and that has helped a lot.
I guess what I am asking here now is ... Is there away to create or manage the Corridor model so that it only generates TOP codes?