You can use Partial Autoroute on the Edit Cable Path ribbon to re-route a portion of a cable that is currently complete. When modifying the way features, do not select straight features. Select only features with branch points. After you modify the cable path, Partial Autoroute does not consider straight features but remembers the last saved along-leg features. The command can modify the selected cable in the following ways:
Partial autoroute between existing entry and exit points
Partial autoroute between two points on the current path of the cable
Partial autoroute between the entry point and a point on the current path of the cable
Partial autoroute between a point on the current path of the cable and the exit point