Hey Smokin,
If you want to have separate parts of the car but want the car to move as 1, you could use pin behaviour for this. (or you could use everytick-> set part to X location).
Lets say you want to pin the wheels onto the body of the car. When you create you car you will still need to correctly arrange the parts in the right place, but then you can use "pin" and it will stick in the same position no mater which way the car moves.
The event could be something like
On right click -> Create object -Car
-> Create object -Wheel
-> Create object -Wheel
You can put all of your pictures or cars into 1 object, you then just need to use variables to tell the object which picture or animation to use.