The Undergraduate Enrolment and Registration Guide contains the instructions:

If enrolled in a course with multiple lab meeting groups, tutorial meeting groups or course sections, you can transfer to a different lab, tutorial or section of that same course in the same term:

1. Click Transfer a Course.
2. Type the catalogue number that you want to transfer into.

- Click Transfer Course. The catalogue number, course and title will be displayed. If this is the transfer you want, then click Yes.

A course transfer can be made without financial impact.

If the target section is full, then you will not be able to execute the transfer.