When importing a PCB from an IDF file, hundreds and even thousands of subparts of electronic components are created. In our use case the electronic engineers design and manage the PCB in their own electrical E-CAD software. After import into CED the PCB-assy is only used for space-claim, mounting and harness-routing. This means that it does not make sense to store each individual subpart into ModelManager.
I propose to add an option to remove the read-only-flag of the top-level assy and make it inseparable automatically (like the option in Cabling) so that the PCB can be stored as a single object.