Dear Aspirant 

First of all Congratulating you on your nice performance that you are deserving some college now I would like to tell you that there are three options provided to you once seat is allotted these are:-

1.withdraw

2.float

3.freeze

If you choose withdraw then your allotment will be cancelled and you will be asked to choose and appear for another round of counselling, but if you have choosen float your college will be alloted temporarily and you have to pay seat acceptance fee and if there is an up gradation in further round then you will be alloted a college which is higher in your preferences and then you can choose float or freeze as per your likes. In freeze your college is allotted to you and now you have to just pay seat acceptance fee and then fee and documents verification. You have to pay seat acceptance fee once either during float or freeze.

Good luck for your counselling procedure :) 

Feel free to ask if you have any further queries.