lot number

Hi, Im wanting to bundle the quantity of the product to make it more thrilling. And when I'm editing the product, at the General section, there is a section called "Lot Number" (https://prnt.sc/qvyca9), so I assume it is the number of product on 1 order (in Aliexpress, because when I changed it...

I found new issue on product page. I've just added new product to my store and set lot number to 10. It means when someone buy one piece, there will be 10 in the package. System does nothing when Lot number is changed.