I’ve made a design in FH3 for the Ford GT HE which I would love to use in FH4 but I’ve found out that the car isn’t in the game so is it possible to use it on the standard ford GT?
No … not as a whole design. Transfers from one game to another have to be on the exact same car.
What you’ll need to do is go into your design in FH3 and save all the sides, front, back and top as complete layer groups. Then you can import those groups into FH4 and apply them to the car in FH4. Hopefully it will line up close enough that you won’t need to tweak it too much.
No, BUT you can save it as a vinyl group and then transfer it onto the other vehicle. This all depending on if you created it or not.
If I remember correctly, the Ford GT FE has a mirroring bug on the top, but the standard one doesn’t. So you may need some adjustment after transferring the vinyls as described above.