You have the ability to sell more to your guests or to allow them to select commonly offered items like a beverage pairing as an optional extra rather than a requirement for your event. To do so, 

 1.     Visit the event editor in the admin

2.     Expand the Settings section and select "Use Optional Extras"

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3.     Click Save & Next

4.     A new section opens up further down, and you can add the extra details including price and whether the item is for purchase before or only during the event

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Optional extras purchased by the guest will show in the Bookings tab when you expand a guest's details as well as in the guestlist download.