Automobile Design

Hi Chandan,
India is best for automotive designing courses, you can go for NID entrance exam.

The best way to go about it is to pursue a Masters degree from NID or NID in automobile designing and carry forward the same as a working professional.

Hi Rohit,
UPES does not have automobile design course, but as per the description you have shared, they do have M.Des in transportation design course.
The fee structure of the same can be found in the link below:
http://www.upes.ac.in/upes_sods/m-des.php#tab-6
Also if you're interested in specifically

If you want to pursue M.Des then National Institute of Design is the best option for you.

You can change your branch in B.Tech after completing Diploma in mechanical engineering.

That totally depends on which field you want to pursue. NID doesn't offer Automobile design for B.des hence in case you wish to pursue that, you will have to graduate in another field. Having prior knowledge of product design studied in graduation however, may help you excel in the post grad course.