Hello Gaurav,
If you want to design automobile like car bosy design etc then you have to go in engineering field. You have to choose MECHANICAL ENGINEERING. There is a course which is teach you in B.tech mechanical is AUTO CAD, SOLID WORK etc which is totally design.
Which helps you a lot.
Good luck.

Hello Gaurav,

It is totally depends upon your choice or in that subject you have deep knowledge and interest so that you can score good marks in that subject and then you will become an expert of that field.

Thanks for query on this platform, you may visit again for further queries.

All the best.