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Click Place Opening Command on the vertical toolbar.
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Select the object in which you want to place the opening. You can select walls, slabs, and members.
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Click Select Boundaries on the Place Opening Ribbon.
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Select objects in the model to use as boundaries of the opening. You must select the boundary objects in a clockwise or counterclockwise order.
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Click Accept .
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Optionally, define any offset from the boundaries that you have selected.
Type 0 to place the opening edge on the boundary. Type a negative number to offset the opening inside the boundary. Type a positive number to offset the opening outside the boundary. This offset can only be applied when the selected boundaries are lines or planes.
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Click OK.
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Click Finish.