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Extra Sets
Extra sets are a way for you to group and categorise your extras in such a way that will help provide more of an overview of the extras sold for your event.
You may for example have multiple extras related to merchandise, and multiple extras related to camping. By creating an 'Extra Set' for each of these categories you can then assign your extras to the relevant set, and this will allow you to see at-a-glance how many of the merchandise extras have been sold and how many of the camping extras have been sold.