Can someone tell me how to edit a vehicle's file in BeamNG?

Can someone tell me how to edit a vehicle's file in BeamNG?
The other posts on the forum are too old, so I think it's better to ask.

 

I think this requires a little more clarification on what you want to do?

Do you want to edit the 3D model itself?
Do you want to edit jbeam files? Materials? Thumbnails?

 

the basic file structure if you want to edit files is to copy them to:
appdata/local/beamng.drive/0.25/vehicles
or 0.25/mods/unpacked/new folder/vehicles

that way the game will read them instead of the vanilla files, but if you want to get rid of the changes, you just delete that file and it'll go back to reading the original file.