Items in your inventory can depend on other items. This comes in handy when it comes to bundles or having an inventory item be dependent on materials.
To demonstrate, here we have single bottle openers as well as bundled bottle openers. The bundled bottle openers (10-Pack and 3-Pack) should have a lot more in-stock based on the number of single bottle openers available. So let's make the bundled bottle openers be dependent on single bottle openers!
Click the three dots at the end of the row to bring up the context menu and then choose Edit
Add the bottle opener as a component to have this bundle depend on it. We can search for it by name or SKU!
There it is! Click the + button to add it as a component. We'll then need to specify the quantity. In this case, it would be 10 since it's a 10-Pack and there should 10 single bottle openers in this bundle.
Click Save. The stock will then be automatically adjusted to take into account this new dependency!
From now on, anytime the "Bottle Opener" stock changes, the "Bottle Opener 10-Pack" stock will automatically re-calculate (and push out to any synced listings as well). Likewise, anytime the "Bottle Opener 10-Pack" stock changes, the "Bottle Opener" stock will also adjust.
You can build some very powerful configurations with this. The sky's the limit!