Multiply Fee on a single product quantity

Hello Support,

We’ve just bought the pro plugn but didn’t find the solution yet. We’re trying to make a condition so when the same product add with more then 1 quantity it should be multiplied.

For example if the fee is set to $3 for a category or product, so when the product added to the cart with 5 quantities the fee should multiply like 3 x 5 = $15.

Please response asap.

Thanks,

Yasir