As per the official website there are no official notifications available for the transition of subject in Andhra University. So I would say you should contact your college authority they can only give you proper information.

Now in general the transition of subjects are very possible in case of Engineering. As Engineering 1st year course is the same for all the branches. If in any branch a vacancy is available one can transit to that branch depending on there 1st year performance. This is a very general case for most of the universities. But change in the whole discipline is a paradigm shift and it can or cannot be done is based on the Andhra University policy which you can only get from the office authority since no information are available online.

I hope this answer helps. All the very best for your future endeavors!