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Yes how?

I'm not too sure, but here are the basic's as I understand them.

First, you need a 3D Modeling program, one that supports more model types the better.
Then you need to find your desired choice of models to convert. Check copyrights and permissions.
Here is where I'm really not sure, Import the model, change/alter what ever ? then export the model as a new model.

I do new car and add parts to it. Like that?????
Oops!!!!! Little mistake i mean car modeling