If you studied at another learning institution in Canada, you should change your Designated Learning Instruction with IRCC.
The instruction guide can be found here.
If you have a co-op work permit from your previous DLI, you must apply for a new one after you transfer to NSCC. Your co-op work permit must indicate your current DLI as “Employer”.
As soon as you update your DLI, you should obtain a letter of enrollment from Student Services, and submit an online application for a new co-op work permit.