One - Broadcast can suggest a product to pair with. The customer can choose the upsell product from the Cart after adding the primary product.
Two - Customer can add the upsell product to the Cart directly from the main product page and also add the primary product to Cart.
_upsell_radianceto Carnation which implies that Radiance is the product we want to promote on the Carnation page
_upsell_to make your upsell tag =