Hey arya

If you have participated in JOSAA vounselling but withdrawn your seat , you can still participate in CSAB counselling. All you need to do is to register for counselling of CSAB special round on the official website of CSAB

TO know more about CSAB special round counselling , follow the given link:

https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis

Hope it helps!