thank you deepak for reply.i am also in a similar situation.I also recieved noi on 29 june.As far as i know we need not do anything and this invitation is valid for 6 months from the date of receipt.14 days is the period to submit the profile once you create an account on the ontario website.
But as I understood from one registered immigration expert,, since ONIP issued so many NOI and if their quote get filled before you submit your complete profile your seat is not reserved. You may loose your PNP and it is obviously they have limited quota yearly.