One of my friends has done the same thing in the year 2010-11. He chose Metallurgy, but later, he changed his subject to IT. This rule was accepted during his time or the prior years of his admission. However, in recent days, the college management has changed the rules in the previous 3-4 years.
The college administration thought to fill up the vacant seats; however, no new seats will be crafted as per the requirements. This is why no up-gradation can be made for the new seats of the same department.
However, the previous rule is back again, in which 10% enhancement has been made considering the seating for “upgraders”. Thereby, if you want to take admission to this institute, you have to rely on this regulation to change your stream in the future.
But you be prepared for the surprises as the college administration can change the existing rule at any time. It may be or may not be ensured depending on the present rules and regulations of PEC Chandigarh.