Before routing wires or cables in an assembly, you must create a harness. A harness is a part file that contains cables and wires within the assembly. When you create a harness, it is named and saved as a .prt file, but it can only be accessed within a Cabling assembly and cannot be opened in Part mode.

You can output a harness to a drawing view: by selecting a harness part and setting it as the active model using Set Model or by selecting a flat harness. You can open a harness in a Drawing. Create or open a drawing of the cabling assembly. Right-click the harness part in the Model Tree and choose Set/Add Drawing Model from the shortcut menu.

You can create several harnesses in the same assembly, but only one harness part is active at a time. The name of the active harness is displayed in the graphics window, with the label Work Harness. You can add features and select cabling entities only in the active harness. You can select cabling entities that have been added to other harnesses only when the respective harness is active.

To organize a large design, you can divide the harness into subharnesses. A subharness is a subset of a harness part and not a separate file. Subharnesses can use all the entities available to a harness, but you can also create them separately in Harness Manufacturing mode.