General information about cohorts/course lists can be found here.
For (P)GME programs using CBME, residents should be stored in course lists in order to easily add them as the audience of a course. Course lists are managed through Admin>Manage Cohorts. We recommend that you create a course list for each academic year and populate the course list with all learners, CBME and non-CBME, who will participate in that program for the specified time.
If you are syncing your users with another source, your course lists may be automatically populated. It will depend on the script written by developers to connect Elentra to your other source of user information.
When you create courses, you can set the Course List as the audience for the course. It is important that learners be enrolled in a current curriculum period for them to be able to trigger forms and have forms triggered on and to them.