Add Unit Enrolments to a Course Enrolment
Then from either the student program screen, you can either add a new course enrolment & associated scheduled units with one click.
If the course enrolment that is loaded is associated with a scheduled program, you can add all units for that scheduled program.
You can also do this for any unenrolled units via the student units screen. The new unit enrolments will have the default enrolment status set on the scheduled program screen