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In the tree view, click Piping > Piping Specification > Piping Materials Classes.
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In the Piping Materials Classes branch, open a specification and click Piping Materials Class Rules > Thickness Data Rule.
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Click the Insert Row Command to insert a blank row in the grid view.
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Define the thickness data rules by providing appropriate values in the different columns.
The Thickness Data Rule sheet in the Piping Materials Class.xls workbook corresponds to the Thickness Data Rule node. See Piping Reference Data.