How to make a multiple increase in the quantity of goods?

Question

1C-Bitrix

Hello.
There is a task, for certain goods, to make a multiple increase by default. That is, initially it is necessary, for example, that the product has a quantity of 12, and not 1, if you want to add, another 12 is immediately added, etc.
The problem is that you cannot change any conditions in the catalog. In other words, initially the product has a quantity of 1.
If anyone has come across, share. Well, or just good advice does not hurt.

Answer 1

Are you talking about this: https://yadi.sk/i/zbTyaVSIPQEx-Q ?

Answer 2

They did something like this, but in a different way.
The product with the quantity is hidden (hidden section and filter in the search, the filter in the sitemap. You can't deactivate it - inventory accounting will be buggy !!!), but a kit product with the required quantity is made. This is the regular functionality of Bitrix.