Hey @Philip Theis Vine
Thank you so much for coming to the Klaviyo Community for help with setting up a custom catalog feed for your marketing!
The easiest way for you to accomplish this would be to set up a custom catalog feed which you can have your Klaviyo Catalog retrieve and sync those products through to use within your Klaviyo created marketing. The custom catalog guide I linked will walk you through the requirements for your custom catalog feed and how to sync your custom catalog feed to Klaviyo. Once your feed has been built and synced to your Klaviyo account, you will be able to use Klaviyo’s Product Recommendation, Product Block, and Catalog Lookup Tag features. Klaviyo resyncs the information from a given catalog feed source every six hours. If you make any updates or changes to your catalog it may take up to six hours for it to reflect in Klaviyo.
Once all of this is done you can use the Product Block feature in your email editor to pull dynamic content from your catalog into your marketing! Also check out these community post about using custom catalogs with Klaviyo.
Hope this helps, and thank you for being a part of the Klaviyo Community!