What happens when the existing model and drawings are done. The basic idea is to keep the existing conditions, both the PLN and the layout book, tucked away safely. It is theoretically possible to get existing drawings out of the addition project, but it's more trouble than it's worth. It's important that the existing work be complete at this point.
Searched for "demolition"
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Intersection group number is an AC8 feature that controls which layers clean up to each other. If the numbers match, they do, if not, they don't.
A thorough going over for the existing/addition template complex, which really needed it. Let me know what you think, since I don't work on additions much.