If you find the JBeam part that contains the license plate (identified with the "Display names" option in the part selector), it should contain a section that looks like this: "flexbodies": [ ["mesh", "[group]:", "nonFlexMaterials"], ["licenseplate", ["car_bumper"], [], {"pos":{"x":0.7, "y":-2.2, "z":0.106}, "rot":{"x":-66.1, "y":-47.1, "z":50.7}, "scale":{"x":1, "y":1, "z":1}}], ], To move the bumper to the trunk, you'll need to do two things: replace the bumper node group with the trunk node group, which makes sure the plate is attached to the trunk physics-wise, and then adjust the position and rotation values so that the plate sits in the right position and at the right angle. Reloading the car with Ctrl+R will let you test changes you've saved to the JBeam file without having to switch to another car and back.
Yeah, I've tried that, but I want it to like move with the trunk, like instead of just staying in the same spot when I open it
