Update stock only within a specific manufacture_id

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.4
-- PHP version -- : 7

I have many products with different brands

Brand A
Brand B
Brand C

My stock CSV update file contains "only" product_code, and product_quantity.
It contains product_codes within both Brand A, Brand B and Brand C

I only want to uppdate the quanity for the products with Brand A.

Brand A have manufacture_id: 781

Therefore I havel selected under filters: product_manufacture_id = 781

Se image below

So when I process the Mass action it still updates the quanity of the products within Brand B and Brand C.(actually every product_code in the csv file)

How can I force mass action to only update the product_code from the CSV file that goes within manufacture_id: 781) ?

Hope my explenation makes sense.

OK tnx for reply.

Anyway I have a new question.

I.e: I have a main product with 3 variants. All of the 3 variants have "product quanity: Unlimeted".

But the quanity of the main products has been set to "0", so my customers get the message in the front-end that it's sold out.

How can I force the product quantity of the variants to override the quantity of the main product ?

So that my customers in the front-end can buy the product even tough the quanity of the main product is set to "0".

The problem is that sometimes I forget to remove quantity"0" from the main products after I have updated the vaules of the variants.