Hi aspirant,

There is no way you can participate in CSAB counselling process if you have been allocated a seat through JoSSA counselling unless you withdraw from it as the criteria for appearing in CSAB counselling states that:

• Candidates should have a valid JEE Main rank.
• The JoSAA 2021 eligibility criteria have to be met by candidates.
• Those candidates who participated in JoSAA 2021 but who were not allotted any seat will be eligible for CSAB 2021 special round.
• It should be noted that those candidates who opted not to participate in the special round after JoSAA will not be eligible for CSAB 2021 special round admission procedure.
• Candidates who are allotted seats through JoSAA 2021 but did not accept or cancelled the e allotted seat will also be eligible for CSAB 2021 special round..

More information about CSAB counselling can be found at https://engineering.careers360.com/articles/csab

Hope it helps!!