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Select the slab to edit to display the Place Slab Controls.
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Select Define Boundaries .
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If you want to delete a boundary from a slab, select the boundary in the Name and Offset Grid.
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Select Delete in the the Place Slab Controls dialog.
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If you want to add a boundary to a slab, select the object in the graphic view.
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Select Accept to confirm the highlighted objects are the boundaries to use.
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Complete the placement:
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Select Finish (CTRL + ENTER) to save your changes and exit the command.
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Select Finish and Modify (CTRL + SHIFT + ENTER) to save your changes and then start the modification of that object.
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