Dear sumit
For this you must have a Rank in Architecture streem.
For engineering streem rank you can't getadmission in Architecture branch
for detail seat allotment check the link
http://ccb.nic.in/ccb2009/aieeecouns09/orcr/SelectInst.aspx
Please feel free to post as many doubts on our discussion forum as you can.
we will get you the answer and detailed solution very quickly.
All the best.
Regards,
Askiitians Experts
Badiuddin