Hello @Djimmy,
Welcome to the Klaviyo Community!
Since it sounds like you are pushing custom events via API to record these customer purchases from your physical store to Klaviyo, it would not be possible to mimic how the event displays similar to that of a supported ecommerce’s (Shopify, BigCommerce, WooCommerce, Magento, etc.) Placed Order event.
Unlike events passed from a supported ecommerce platform, the data passed by custom events made via API aren’t recorded in any standard manner due to the custom nature of them. For this reason, only integrations supported by Klaviyo will have this unique UI handling as @retention cleverly deduced in the following Community post:
In the instance your physical store’s POS system shares the same ecommerce backend though, those in-store POS sales should also be recorded as Placed Order events under your ecommerce platform - in this case WooCommerce - and synced to Klaviyo with this unique collapsable UI if an email was recorded with the sale. An example of this behavior would be a store using a Shopify backend whose physical stores are using a Shopify POS system.
David