Students are enrolled in an organization during the student record creation process. You can move a student to another organization by changing the student's enrollment. Use these instructions only if you need to add to or change a student's enrollment.
A student can belong to more than one organization.
From Setup > Students, select students then open the task list and select Enroll Students. Select any existing organizations to have them display on the page. Use the check boxes to indicate whether your selected students are enrolled in each organization.