Update Multi-Select Field in another form based on input.Course field

Update Multi-Select Field in another form based on input.Course field

i have a multiple select field under Students form with the available sessions for January. Field name is January
In the Course form, I have a multi-select lookup field for the students.
When I save the Course form, I want to update the multi-select field of the selected students to reflect the course name
Course name in the Course form is the same as the options in the multi select field under students.

Is this doable? Thanks!