I currently sell across almost all of the Amazon international marketplaces, and have a good number of items that have one ASIN in certain regions, and another ASIN in others.

A good example of this is B0BGT61797, which is available in all regions, and B0BH3QYL7M, which is an ASIN only on Amazon.jp.

Since these two ASINs are the same item, I currently have to manually keep them in sync (e.g., if I run out of stock on one listing, I still need to manually change the other).

It would be great if there were the ability to manually link ASINs together such that any changes to the stock of 1 ASIN also affect any other linked ASINs along with it.