Duplicate the folder of the cable tray to modify it to your needs. Click Open catalog to open your copied catalog and start. On the Modify | Cable Trays tab, specify a command. The Cableway, Current Branch and Material Name fields are automatically populated with the owning elements and current element. Attributes The attributes entered in the Create. Was to create a custom, line based, straight run cable tray family. 05-18-2016 10:20 AM Seems. My aim is to draw a line with the revit line command and use the dynamos script to draw the straight stretches and the curves according to the angles of the vertices. The cable tray will be laid according to the dimensions selected previously, as well as the type of cable tray to be installed. AVEVA Solutions Limited and its subsidiaries.