Adding a cable to a splice

Hi, everyone.

I'm trying to find the recommended process for adding a cable to a splice. I'm running Creo 3. Here's the setup:

• There's a network routed that goes to and from the splices.
• There are a bunch of cables that already pass through the splice in question, and they are all grouped in bundles.
• I want to route a new cable (or reroute an existing one) and it should pass through the splice, and be included in the bundles.
• Routing through network doesn't work (for some reason Creo doesn't find a path, even though the network is contiguous), but I can do a simple route and manually reroute to pass through the correct locations. However, the only way that seems to work is this:
  1. Extract a cable already going through the splice from its bundles on either side.
  2. Use reroute to let the new cable follow the extracted cable. This way it gets routed through the splice. (Sometimes this means I need to create an extra location on one or both ends of the splice, since I can't start my reroute at a splice.
  3. Add the cables back into the bundles they should belong to.

Is there a simpler way to do this? Can't I just "add" the cable to the splice, just like I can add it to a bundle? Select the cable, select the splice, and done.

ETA: It seems that the method above doesn't always work. Can't get it to work now. Any tips?