There are a number of stages to Car body design
1. Packaging layout
defining the key fixed points and size of the vehicle. Here we have some course-ware on the use of the NX automotive packaging module, but you would have to request special support of a training course.
2. Product styling
defining the form of the exterior. Although no specific courses for automotive I recommend looking at the Shape Studio for Industrial Design training.
3. Class A
creation of high quality surfaces, usually from scans of clay models. We do have training documentation on this topic. You will need to request specific training consultancy for this.
4. Body in White
the engineering of the body panels. We have a training course available for this topic.
Do I understand that what you are looking for is information on how car body design should be done and what the main engineering goals and design challenges are in the design of cars? Or are you looking for support on how to use NX to achieve these goals?
Tejas, there are courses in Industrial Design and Shape Studio that address several of these topics on our Learning Advantage system. You can search the course catalog here:
Here is more information on training resources for our academic partners:
Be sure to check out our Academic Resource Center for other free tutorials.