We need a Lot Grade component similar to the LotGrade subassembly in Civil 3D. However, we need one more additional internal grade break in the new component that the subassembly currently doesn't have, to create the building pad.
The new component should clean itself up through intersections to address the issue discussed in this thread:
https://forums.autodesk.com/t5/infraworks-forum/intersection-from-civil-3d-blob/td-p/7928061
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