You can assign special tables to a commodity group. Once this is done, the special table and the special attributes in the table will be assigned to all the parts in the commodity group.
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Click SRD > Component Manager > Commodity/Ident Management.
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Select the Commodity Group/Part/Commodity Code/Ident from the drop-down list at the top of the tree view.
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Double-click All Commodity Groups in the tree view to open the Commodity Group grid. All the commodity groups are displayed in the grid.
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Click Edit grid
.
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To add a special table, double-click the Special Table column.
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Select the required special table for that group in the LOV dialog box and click OK.
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Click Save grid
and then click Read-only grid 
to set the grid back to read-only mode.