How to subtract the price of an additional parameter?

A

Alex2017-02-06 08:02:45

MODX

Alex, 2017-02-06 08:02:45

Good afternoon, there is a demo assembly of shopkeeper3. When specifying the price of an additional parameter, the price of an additional parameter is added to the price of the product. How can I make it subtracted? Thanks

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1 answer(s)

A

Alexey, 2017-03-10
@masterfreelance

set a negative price

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