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Expand Structure > Shapes.
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Expand the tree view and select destination section library node (such as AISC-LRFD-3.1 or Euro).
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Select the shape node (such as W or WT) to delete.
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Click Delete on the ribbon bar. You can also delete from right-click popup menu.
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Click the Save Command .
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The cross-section part class including all cross-sections in it will be deleted.
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You cannot re-use a part class name even after deletion.