first of all since you are allotted IT you have to pay the required fees and get your seat reserved else you would be disqualified from further upgradation and councelling
after you pay the fees you will be automatically be eligible for further upgradation in third allotments and in real time allotments to your other higher options and then you would not need to attend the real time allotments in person and you can handle it online.
but after the third allotments you would have to attend the councelling for the branch to which you are upgraded to by that time
after that if you are not satisfied with your branch alloted then you can attend the real time councelling online and wait for further upgradation to your desired branch
fees would be refunded after deducting rs1000 if you cancel your admission.