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I don't understand. What's "the smub of a structure"?
I can't answer your question, but perhaps I can help you ask it:
How can I set the sump of a structure at the crown of a pipe not at the invert?
I want to draw the structure from the pipe crown to surface.
I want to know how to trim the part of structure inside the pipe.
Mark Green
Working on Civil 3D in Canada