You can create a different reminder rule for each reminder schedule (e.g. 7, 3 and 1 day before the appointment). This can be helpful for clinics that need to send different reminder email templates (and eForms) a number of days before the patient's appointment.
To review how to create/configure a reminder, please refer to Creating / Configuring Patient Reminders.
Will patients receive multiple reminders?
Patients will receive all reminders, regardless of whether they have confirmed their appointment. Following the example above, if a patient confirms their appointment at the 7-day reminder, they will still receive the 3-day and 1-day reminder emails.