Up-charge for specific variants
Increase price per product with up-charge options while keeping the product page neat :D
While you create options in tab Options, you will see a pop-up window for option detail.
In the field "Option values", find the value you want to add charge and fill the desired extra price.
In this example, I want to add $2 for the medium-size picture, $4 for large-size one.
If you default currency is USD, it will be 3 USD additional charge.
Finally, click Save.
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