Dear Darshit, Automotive engineering deals with designing, developing  fabricating and testing vehicles or vehicle components. Automotive Engineers create and improve motor vehicle body, parts and accesories. Ideally a Bachelors program in Industrial Designing or Mechanical Engineering is a desired educational qualification for automotive designing. So just to answer your question, Car body designing falls under Automotive designing. 

Hello Darshit,

Yes, car body design comes under automotive engineering. 

The automotive engineering field isresearch -intensive and involves direct application of mathematical models and formulas. The study of automotive engineering is to design, develop, fabricate, and test vehicles or vehiclecomponents from the concept stage to production stage.

Hope it helped you

Thank you