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Expand Structure > Shapes
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Expand the section library node (such as AISC-LRFD-3.1 or Euro) to display the shapes available in that library.
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Select the shape node (such as W or WT) that contains the section to edit.
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Click the Grid View Command on the ribbon bar.
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Click the Properties Command to display the Reference Data Properties Dialog.
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Edit the section properties as needed. If you are unsure of what a property is, see that cross-section's information in Member Cross Sections in the Smart 3D Structure Reference Data. For example, if you are editing a W section, refer to Cross Section Symbol W (M).
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Check the Calculate properties check box, and then click Calculate to calculate the properties implicitly, otherwise enter the values manually.
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Click Apply, and then click OK.
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Click the Save Command .