Perhaps an idea to show the Cars and Bikes seperate of each other:
See attached patch for an starter part:
* Upgraded brands to official list for Car and Motorbike manufacturers
* Changed naming on CarEditor to "Brand" instead of "Type of Car"
* Update the Car Dealer to show 2 screen, 1 for Bikes, 1 for Cars
* Allow CarEditor to recognize what type you're adding and pick the correct CarType/MotorType for the brands
PS: The Car Editor could also use a icon so you can see what the editor is about
Any remarks on this idea ?