The Sessions module defaults to a list of existing sessions, as seen below. As with similar list/table screens in Ada, you can search/filter to find the session you need, and then click on it to enter the create/edit screen. Filters are based on tags; for example, you might tag all sessions by Grade Level, Subject, and School Year.
Also as with other modules, you can select rows with the check boxes and then delete or duplicate. Note that you can't delete a session that has been locked and delivered.