Hiii

In BA and MA you are supposed to choose 1 major subject and then there can be some minor subjects depending upon the norms of the college or university you study in.
Example: A Bachelor of Arts degree in Political Science, apart from dealing with Political theories, also teaches about various systems of governance, economics, sociology, international relations, global politics, psychology etc.

Rest you need to refer to te particular universities rules for more details.

Thanks!!

Please specify more your query what do you want to know so that we can help you to solving your doubt.