I can paste both a working surface and a surface from a corridor referencing the working surface to a final surface. But, when I try to paste another surface from a different corridor referencing the same working surface to the final surface, I get an error editing surface. Why can't I seem to add a second corridor surface to the final surface?
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That's what I thought at first. But, both corridor surfaces reference the working surface. So, once I have pasted the working surface onto the final surface, when I paste the first corridor surface, it should cause a circular refference if that was the case.
Do either of these corridors occur in the same horizontal area? If so, you may need to create a temporary surface to paste the original ground and the first corridor. Then adjust the second corridor to target this new surface. Then your final surface would have the original surface, the first corridor surface and the second corridor surface.