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Select Structural Tab > Opening Command to display the Place Opening Controls.
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Select the object for the opening. You can select members or slabs.
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Select how to name the opening.
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Set the Cutting Limit and Cutting Depth if needed.
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Select the parent object plane on which to place the opening.
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Select Define Boundaries .
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Specify the opening size and location based on the model objects that define the boundaries of that opening. The software automatically recalculates the size and location of the opening when those boundary objects move. For example, you can select the outside edge of a beam flange as a boundary along one side of an opening. Later, if the section size for the beam is changed and the flange edge moves out an inch, the software automatically moves the edge of the opening an inch to match the new location of the flange edge.
As you select boundary objects, make sure they form a closed shape (there is an edge for each of the four directions).
The selected boundary objects highlight in blue.
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Define an offset for each boundary that you have selected. Select a row to highlight that boundary in the model. Then, type the distance from the boundary to place the opening edge. 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.
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Select Accept to indicate that you are finished selecting boundaries.
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Complete the placement:
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Select Finish or press CTRL + ENTER to save your changes and exit the command.
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Select Finish and Modify or press CTRL + SHIFT + ENTER to save your changes, and then start the modification of that object.
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Select Finish and Repeat or press SHIFT + ENTER to save your changes, and then restart the command using the same options.
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