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Click Select on the vertical toolbar.
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In the Locate Filter, select Slabs.
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Select the slab to edit.
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Click Define Boundaries on the Place Slab Ribbon.
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Redefine the boundaries by clicking existing boundaries to clear them and by clicking new objects to use as the new boundaries. See Solve ambiguous boundaries.
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Click Accept .
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Click Finish.
You can only edit the exterior boundaries of a slab using the Place Slabs Command. Openings in the slab should be edited with the Place Opening Command.