When you have a unique product that falls outside of your standard sizing upcharges, you can easily add, remove, or change the additional upcharge cost.
How to Change Sizing Upcharges on Individual Products:
1) Click Products on the left-hand menu.
2) Find the product with the sizing upcharge you want to adjust, hover over the product, and click Edit.
3) Scroll down and click MANAGE SIZES.
4) You can now update the Additional Cost Column for the different sizes on the product you are editing. Once you are done, click Save on the top right-hand side of your screen.