Dear student,

If you oot for nay college on josaa counseling, then you are eligible for csab counseling. But if you got allotted any seat in csab round and if you accept it, then your previously josaa seat will be cancelled.

For participating in csab round - You must have given jee mains and have a valid rank. Also you must not got alloted any seat in josaa counselling or if you haven't participated then also you will be eligible for csab . Now, if you got any seat in josaa counseling, then also you can participate in csab (but it will be cancelled anyways). Or you must withdraw your seat from josaa for participating in csab.

So, you can retain your college in josaa but it will be cancelled or better you should withdraw your seat.

Also check out the following link to know more about csab 2020 :-
https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis