You can add if/then or branching logic to Zaps by using filters in multiple Zaps. This allows your Zaps to take different actions based on the trigger data received.
This article walks through an example of a Shopify store with two items: apples and bananas. When a customer buys an apple, their email address should be added to an 'Alpha-Apple' MailChimp list. When a customer buys a banana, their email address should be added to a 'Beta-Banana' MailChimp list.