Yes, you can use your OBC NCL certificate for reservation in both UPSEE and MMMUU (Madan Mohan Malaviya University of Technology) counselling, as long as the certificate is valid and issued by the competent authority. The certificate must be issued after the cut-off date for the current academic year and should clearly state that you belong to the OBC NCL category. Ensure you have the proper documents during counselling to avail of the reservation benefits.