The Cart Upsell add-on allows customers to view and add products directly from the cart. In previous versions of the Debutify theme, Shopify store owners can only add up to 16 products as Cart Upsells, each of which has a separate block.
In Debutify 4.7.0 and later themes, you can add up to 10 products in one Cart Upsell, expanding the limit to 160.
How to Add Cart Upsell
In Shopify admin, under Online Store, click Themes.
Select your Debutify Shopify theme and click on Customize.
Click on Cart Upsell.
Add the Cart Upsells.
Click Save to apply the changes.