You can use seat labels. When you select a certain row and assign a ticket type to it, select it again and another option will appear letting you set a prefix letter (which can be a row letter) and set starting and ending number.
Now, in order for the seat number/label to appear on the ticket, you should place Ticket Type element on the ticket template and as integral part of the ticket type title, seat number/label will be displayed in parentheses next to it.
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