How to Add Product Upsells With Metafields in Shopify Broadcast Theme

Broadcast offers two different ways to cross-sell: an automatic Recommended products section using Shopify's algorithm, and a metafield-driven upsell that lets you manually pair exact products together instead of leaving it to an algorithm.

Steps

1. In your Shopify admin, set up a metafield definition for product upsells if one doesn't already exist — check Settings > Custom data > Products.
2. On the product you want to promote alongside something else, use that metafield to reference the specific product(s) you want shown as an upsell.
3. In your Shopify admin, go to Online Store > Themes and click Customize on Broadcast.
4. Open a product page and add or configure the upsell block that reads from this metafield.
5. Click Save.

Use this where the pairing genuinely matters — a specific accessory that fits one exact product — and leave the automatic Recommended products section for everything else, since manually maintaining metafield pairings across a whole catalog isn't realistic.