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Up-charge for specific variants
Increase price per product with up-charge options while keeping the product page neat :D
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 and $4 for the large-size one.

If your default currency is USD, it will be 2USD and 4USD additional charges.
Finally, click on Save.