Add and remove product in checkout page

FIRST: One without the yellow upsell item… standard order form.

SECOND: One with the yellow upsell item that works to unlock a product if someone checks it. This means that if someone clicks this yellow - it changes the order total and then, unlocks that product membership level.

reference site : https://ek258.infusionsoft.com/app/orderForms/Super-Affiliate-Network-37month

How to add above steps?

below our site payment option
image