What I mean is how do I make a custom version of the car, so I don't replace the whole car. My car is the pigeon.
If I'm thinking about it correctly, you would need to copy all the Pigeon files (in this case), put them in a separate folder in the mods folder, then rename EVERY SINGLE FILE, name in jbeam files & .dae file to something like pigeon2_mirror instead of pigeon_mirror (just an example) & then it should work properly without overwriting the original vehicle. It's a VERY tedious process, but that's what you have to do