Hi shivram ,

If you clear IIFT exam ,shortlisting happens on the basis on your IIFT score.so the top rank 160-170 will go to IIFT Delhi .then next 160-170shift to IIFT Kolkata.

So,you can change from Delhi to kolkata,in case you wish .but you can't change from Kolkata to Delhi .as the whole process happens on the basis of rank .and just by filling the form for Delhi campus ,you are application for the rest.

Thanks.