You can apply the same schedule to two or more individual students by adding them to the "Individual Student Charts" field when creating or editing the schedule.
First, open up the class schedule you want to apply, either in the Active Charts view or by clicking the "Class Schedules" link on the right.
Then click on the class schedule to edit.
Then, at the bottom of the class schedule, select the student charts to have the class schedule applied to. Note, in the drop-down list, you will only find student charts without class schedules already applied. If you want to change this, you must first un-apply the class schedule, and then apply it here.