How to add a tagged product in WooCommerce?

Question

WooCommerce

Hello!
We (in the EAEU) are all waiting for marking and a huge headache for improvements. I plan to make friends with WooCommerce and My Warehouse. There seems to be an export module, but support has not answered questions for months, it looks like you will have to write the exchange yourself.
Question: how to correctly enter a product in WooCommerce so that it has unique marking numbers (KiZ are called), but two products with different KZ are considered one product (for example, 2 pieces in stock)? Use module for serial numbers, for example?
After that, there will be adventures in transferring this number to the payment system for entering into the check, but that's another story))