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I have separate parts list for storm and sewer lines, but they have disappeared from the Network Layout Tool. Even old drawings that already have multiple pipe networks, I can't add parts because nothing shows up in the drop down menus of the Network Layout Tool.
Any advice on how to fix?
You may have to re-map your parts list network. Go to Pipes -> Set Pipe Network Catalog
You may have to get the location it is saved in from another computer on your network.