Before selecting the pipe run for associating hydraulic circuits, open Options Manager and make sure that Hydraulic Circuit appears among the items included in the StockpileItems property.
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In the Catalog Explorer tree view, select the Symbols > Design node.
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In the lower pane, right-click Hydraulic Circuit and on the shortcut menu, select Send to Stockpile.
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Assign a value for the hydraulic circuit's Item Tag property.
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In the Drawing view, select one or more items and in the Properties window, beside the Hydraulic Circuit Item Tag property, select the ellipsis .
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On the Select Hydraulic Circuits dialog, from the Available circuits list, select a hydraulic circuit that you want to associate with the item, and then select Add.
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Repeat the previous step for each additional hydraulic circuit that you want to associate with the item.
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Close the dialog and beside the Hydraulic Circuit Item Tag property, view the hydraulic circuits that you added.