To set up tied courses, go to Core:
  1. Select Departments & Courses from the School menu
  2. Expand the Department
  3. Click the pencil icon to edit the course
  4. Select the schedule tab
  5. Under "What rooms can this course be scheduled in?" select the room type, building and room. 
  6. Click Save & Close
  7. Do the same for each course you wish to have tied to the first course (repeat steps 3-5)
  8. Edit the first course and select the Schedule tab
  9. Under Tied Courses, select the courses you would like to tie
  10. Click Save & Close
Note: In order for a course to appear in the tied course section, the courses must share the room type, building and room. Room and Building can be set to All, however this must match on all courses to be Tied. 
For more information on tied courses, please see this article: What are Tied Courses?