Add a percentage to the price impact in combinations

[dieteticanatural]

I have an organic food store with PrestaShop 8.0.1 and I have the following problem: Among the products I sell, I have organic drinks sold in boxes of 6 units of 1-liter bottles. The supplier sends me the price per unit of a 1-liter bottle in the pricing file I use to update the store.

I created a combination that forces the customer to buy a box of 6 units, creating a price impact of 5 more bottles.

Example:

I have a 1-liter bottle of organic almond milk that costs 3.5 euros. I create a price impact of 17.5 euros. The box of six units costs 21 euros.

So far, no problem.

The problem arises when the price per unit increases; the impact on the price doesn't.

Example:

The same bottle as the previous example, but the price increases to €3.80, the impact on the price doesn't change and stays at €17.50. The six-unit box has a price of €21.30 when it should actually be €22.80, and the impact on the price is €19.

I know I can update the impact on the price manually, but there are hundreds of products, and it would be a tedious task to have to do it every time the price changes.

Does anyone know how to update the impact on the price automatically when the product price is updated?

Or if it's possible to use a percentage instead of a fixed price, or a formula, in this case, product price x 5 units.

Thanks in advance for that help.

Edited May 16 by dieteticanatural (see edit history)

[El Patron]

Hi, as you already know ps does not handle percentages, only fixed.  There  are several mass update module, maybe one will reduce the effort of updating your pricing?

 

https://addons.prestashop.com/en/search?search_query=bulk+price+update&ps_version[]=8.0

[Nelson Lawson]

Hi everyone! I manage an organic food store using PrestaShop 8, and faced similar challenge: I create combination boxes (e.g. 6‑pck drinks), but when per‑unit price changes, the box price doesn’t update automatically. PrestaShop doesn’t support percentage impact by default.
I found that using a bulk price update module or a module that accepts percentage‑based pricing solves this. This helps automate calculations (e.g. product price × units).
Does anyone know a recommended module compatible with PS‑8? Or scripts/overrides that auto-adjust combination impact price based on base price? Thank you!

Edited August 15 by Nelson Lawson (see edit history)