This button will pull the the inventory information from the Variants & Pricing box into that location.
This is similar to the Use Defaults toggle. It will copy the data in from the Variants & Pricing section to that location.
NOTE: This function is currently available to select users opted in for Beta access as we gather feedback and refine the functionality. It will be rolled out to other Shopventory users over time. Please start a chat if you'd like to have Beta access to the new interface.