All products in Skio can be set up as 1-time eligible, and these will display in the customer portal for subscribers to add to their next order as a one-off product
Skio offers the ability to offer additional discounts on these 1-time upsells to offer additional incentives for customers to purchase them
Editing the price for 1-time upsells can be found in Skio > Products > "Product name"
On the product page, toggle the option to make the Product eligible for one-time upsell and set a discount percentage in the box that appears underneath.