How can I up-sell drink or snacks using modifiers?

Using modifiers, you can easily set up a flow for the customer, and let them choose a drink with their meal, or maybe a snack with their drink.

If you want to know how to add modifiers click here

You can also use modifiers to set an upsell as default. For example, a double espresso shot is set as default, and the customer can choose to change this to a single shot if they want to. This can also be done with drink sizes.