Adding multiple skins to vehicles

Hi, Im new to this 'game' and am just creating my first skin and i was wondering if it was possible to add the skin as a separate vehicle so you have it a follows:

- Gavril H-Series

• H15 Vanster V8 RWD
• H15 Cabster V8 4WD stripped
• H15 Vanster V8 RWD "my skin"

and if it is possible how to do so?

EDIT: In other words i want to create a (engine) variation. Anyone know how to do that?

Thanks in advance

 

im trying to do the same but i only had Gamecrash after using