yes, you can shift from sol to regular DU college. but it's not that simple, your possiblity to migrate depends on the factor, your performance and available seats.

as you have mentioned that you have completed your 1st year of bcom(p) and if you want to change to regular then there are following requirements to note:
1. your Academic performance should be above 60%, that means your 1st year CGPA should be higher than 6.
2. your result should be declared before the migration period ends of regular college.
3. most important is availability of seats in B.com (//B.com) (P). you need to select the college that should have available seats to offer.

For procedure there are following steps you need to follow correctly:
1) Check the college website online, they notify in there notice dashboard about any migration or seats available for specific courses. you can check those college which are in your interest or you want t admission in.
2) Documents are necessary for example they'll ask for you first year marksheet, no object certificate from SOL and even your identity proof.
3)after completing above 2 steps you can submit your application to the college.

There can be some challenges that you need to face in the procedure of migration, such as like:
- sometimes results get delayed
- Number of seats are limited
- some times approval of principal is hard to get.
- Possible chance that you get admission in college different from your choice.

You should give your 100%