Hey karthik;

Yes , if you were alloted a seat in Josaa secenth round counselling , but you did not report to the college , then also you can register for CSAB special round . And in this case , there are two options , if you have paid seat acceptance fee  , then you will be required to pay only a fee of Rs.1500 for CSAB special round but if you have not paid any seat acceptance fee , then you have to pay the whole fee.

Tk know more , follow the given link;

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

Hope it helps!

Hello Karthik,
You can't participate in the CSAB special round without withdrawal of your allotted seat in 7 rounds of JOSAA counseling. If yu didn't report at your allotted institute in the time of 19th July to 23rd July then your number is automatically rejected. If you want to participate in the CSAB special round 2019 then you have to report at the allotted institute. Hope it helps you.
Thank you.