Hello everyone 
I hope there is someone who can help me with this issue. I am using prestashop ver. 1.7.5.2.
My method is that I'm using csv. import from my supplier. The supplier has only products without combinations, and in my store I have created some of them with combinations.
For example, my supplier is using " Reference " on every product " xxx. Blue " " xxx Purple " " xxx Black "
And what I have done I have made a new product with combinations, " xxx " and there I have used the reference field for " xxx Blue " " xxx Purple " xxx Black "
My problem is that I can't update the quantity on my products with combinations by importing my supplier csv.
Prestashop is not coming with any errors during import.
These informations from my supplier csv.
Product ID, Price, Tax, Categories, EAN 13, Quantity, Tax rule, Active/inactve. Reference, brands.
Is there something I have missed ?