change quantity in stock all products in a category

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.5

Hello
There is a way to change the quantity in stock of all products in a specific category at the same time??

THanks
Frank

OK thanks I read the documantation about that now I have a doubt
I want change the quantity of all the products of category with id 22
Can you check the setting in the screen shot if is correct..I have a doubt about the operation I don't know what is correct in my case if INT FLOAT OPERATION STRING

thanks
frank

Thanks it works

Just to know...what is the difference between INT FLOAT OPERATION STRING??

THanks FRank