You are able to assign the various sale items to Departments for reporting purposes. This window allows you to add and delete Departments as well as assign individual sale items to a Department.
Court Hire, Courses, Events and Pro-Shop are all 'hard-coded' Departments and cannot be deleted however you can rename them if you wish. If you try to delete a Department that has items assigned to them then you will be notified accordingly. You will need to re-assign those items before you can delete the Department.
The upper window is where you manage your Departments. The lower window allows you to assign items to Departments.