I think I follow what you mean... barely. But here's an pic of the .cr2 file as seen in Notepad. The main actor is Car Body, and all the other parts are parented to it. Can you look at this example and tell me what I need to change in the main actor? I can then go ahead and change it, plus all the other actors as well...

Here's the link to my freebies:   https://www.renderosity.com/mod/freestuff/?uid=493127

My cousin Jack can speak to beans. That's right.... Jack and the beans talk