Mail Chimp can segment your customers based on a variety of fields. Segmentation can be split by items purchased, category purchased, the amount spent, and much more. This can help organize which customers you want to sent marketing emails based on what the customer purchased in-store.
Please see the Getting Started With Segments guide provided by Mail Chimp for more clarification here: https://mailchimp.com/help/getting-started-with-segments/?_ga=2.150030847.872816516.1613680075-1497533823.1613680075
We have also attached the link on how to create and sent to segments by Mail Chimp here:https://us1.admin.mailchimp.com/support/?_ga=2.150030847.872816516.1613680075-1497533823.1613680075