Navigate to Query and apply the KEEP statement listed below using the appropriate section number:

KEEP STU SEC MST IF MST.SE = XXXX

Then navigate to Scheduling Process/Mass Change or Add Course Requests.  

Add the course request by entering the course number.  

Click the Preview button to view the list of students that will be affected by the update. 

If correct, click the Update button to mass add the course request.

Afterward, cancel the KEEP statement.