Hello!

You don't have to register again.

Those candidates who are satisfied with the seat alloted yet want to participate in further rounds of counselling will have to opt for choice 2. The candidates will have to pay the admission fee but will be considered for the next round of counselling for Karnataka MBBS 2019. If a higher option is allotted in the next round then the earlier allotted seat will be cancelled automatically. 

Check out the link below:

https://www.google.com/amp/s/medicine.careers360.com/articles/karnataka-mbbs-counselling/amp