Yes, you would do this just like you would schedule future appointments. Click on the Calendar menu, then click on the button '+ Create new' in the top right corner (system version 4), respectively the 'New Appointment' button in the top left corner (system version 3). You can select a date for the appointment in the scheduling window. To select past months/years, you'll use the little calendar arrows on the left side of the month/year to navigate, select the date & time of the past appointments, add the client/group, then save.
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