Specific price

[Yohan Hexagone]

Hello, 

On my site I have several specific prices and I want them to be cumulated, here is an example: 

My product is 35$, I have two different but cumulative discounts.                                                                                                                      When the customer orders 10, the price is decreasing -- > 29$.

Apart from that, no matter how many products are ordered, a 15% discount is applied.

How can I set my specific prices so that the 15% is applied regardless of the quantity?

Thank you for your answer

[joseantgv]

Specific prices can not be accumulated. You need a module to do so: https://addons.prestashop.com/en/promotions-gifts/7422-price-increment-reduction-by-group-category-and-more.html