Hello, @bagshaw50,
Unfortunately, there is no such functionality in our theme, for now, Upsells is the WooCommerce default functionality and you can set it by editing the product and it will show on the single product page but there is no option to set the discount for the selected add to cart items based on those upsells products, You have to try with any third party plugin which better meets your requirements.
Regards 8Themes Team.