Flattened Harness BOM Inquiry

Hi everyone and thanks in advance for any help!

I am using Creo 4.0 and would like to generate my BOM table and balloons off of a flattened harness assembly. However, I haven't been able to figure out how to add terminals, wire seals, cavity plugs, etc., to the flattened harness to pull them into the BOM. Right now it only pulls in the connectors, clips, back shells, etc., which are designated as connectors or attached to the flat harness using the "attach" feature. I realize that I could create 3D models for all of these internal components and assemble them to the connector.....and then route my wires to (or through) them. But some of my connectors have high pin counts so the thought of doing that makes my head spin.  🙂

Has anyone run into this same issue and found a way to get those internal components to attach to the flattened harness assembly? Let me know if further information is needed in order to assist me.

Thank you!!