How to make a product only purchasable as an add-on in an online store?

[rkpindustry]

I am looking to set up a system where a customer can only add Product B (a gift) to their cart if they've already added Product A. In other words, Product B should not be purchasable on its own, but only as an add-on to Product A. Can someone please suggest any app on shopify to achieve this ? Thank you

[Sweet_Savior_3]

Hello @rkpindustry 

Welcome to Shopify Community.

You can check the apps feature: 

#1. https://apps.shopify.com/freegifts

#2. https://apps.shopify.com/goodapps-free-gifts

#3. https://apps.shopify.com/free-gift-on-cart-manager-pro

Or if you don't want to go with app, then it can be hardcoded, the gift product can be excluded from buying alone.

Thanks