Course requests can be removed in bulk by going to onRecord:
  1. Select Academics > Scheduling > Requests and Schedules > Overview 
  2. In the Course Requests box, click More Actions
  3. Click Delete Requests
  4. Select the type of request
  5. Search for the Course
  6. Click Next
  7. Next to the grade level at the top, Click Add
  8. Do this for all affected grade levels
  9. With all the Students selected, Click Delete requests/recommendations