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In the tree view, click Piping > Piping Specification > Model Rules > Size Reduction Rule.
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Click the Insert Row Command to insert a blank row in the grid view.
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Select the size reduction type (concentric or eccentric).
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Enter the first and second sizes for the size reduction rule.
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Enter the second fitting's first size.
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Optionally, enter the third and fourth fittings' first size.
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Optionally, enter the size reduction preference order.
The Size Reduction Rule sheet in the workbook corresponds to the Size Reduction Rule node. See Piping Reference Data.