For current functionality, the max wire number for cable is 12. In project design, the wire number in one cable may be 16, 18, 20 or 24. Some modules, for example cabling, mold and etc, there is no any enhancement for them during Cocreate 16.0, Creo Elements/Direct 17.0 to 18.1
It would be helpful if there was a way that the user could define the number of wires and base it on a user-defined cable pack to define the wire packing within the cable bundle.
Have you explorer the new capabilities 20.1? (see https://learningconnector.ptc.com/content/tut-5876/new-method-for-routing-cables )