Voucher setting which lower the price of product

[A G]

Hello,

Is it possible to set vouchers to lower the price of product instead of adding all price drops and subtract them from total price?

We use custom tool to import orders from Prestashop to our ERP and preparing invoice. Problem is that we cannot add quota discount to the invoice, only %.

That's why we need to have price of the products reduced instantly. Can this be done by setting up build in tool or we need some custom module?

Thank you.