How to model car body-in-white in CATIA?

I am looking for tutorial to model a full-scale body-in-white structure in a CAD software. Since I am more familiar (but not so skillful) with CATIA, I hope I can find tutorial for CATIA. I will be very grateful if anyone can suggest me where to get this tutorial.
I tried to download a part sample from this Grabcad already, but I couldn't understand the step used.

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