Hey there @Paul from Concise Digital,
Thanks for being part of the community! I think what you might be looking for is some documentation regarding creating an upsell flow + product feeds!
I have provided an article that will provide step-by-step visual and written instructions on how to create an Upsell or Cross-Sell Flow.
This article will provide instructions regarding the flow trigger, flow filters, timing, as well as the recommended content that should be used when sending upselling or cross-selling emails.
If you haven't already you would also need to create a product feed as they are a type of data feed that can be used to generate product recommendations in an email. A product feed will pull product information from your Shopify integration and display this information in an email template for either upselling or cross-selling.
I also had a previous conversation on this community post:
which went over similar details that you might find helpful!
Thank you and I hope this helped!
Alex