Variation Shared Inventory for WooCommerce

I want to deduct inventory from multiple variations with a single ‘bundle’ variation.

For example, if I have 3 variations of a sticker, and a 4th ‘Set’ variation which deducts inventory from all three (like a product bundle, but as a variation).

Right now the UI lets you add the same variation to multiple groups, and intuitively you’d think it would detect the lowest inventory of all linked groups and deduct from each when purchased – but it only links to one of the groups (likely whichever has the lowest Variation ID, but I cannot confirm).

If this feature is not added, it would be nice to clarify that the current behavior of adding the same variation to multiple groups is undefined / not supported in the documentation: https://woocommerce.com/document/variation-shared-inventory-for-woocommerce/