Car Editions, create versions of each model.

[Zane94ss]

Just like real-life companies, you can create a core model, and versions based on the core. Take Porsche 911 for example, you've got, the Carrera, Carrera S, Carrera cabriolet, and so on. Make automation game create a core model, then, you can create versions of the core, like supercharged engine, better transmission, or new grille!

[Daffyflyer]

Yup, that's how it works already with platforms and models, see the "Building a car from engine to completion 2012" video on our youtube page

[haitch40]

Will you be able to make different grades. For example same model but this grade has leather seats or a better engine etc. Or will you add what optional extras we can offer?