What this does
Choose the Shopify location that should receive stock when no specific Shopify location is selected.
When multiple locations are disabled
If you are not using warehouse mapping, all imported stock will be sent to this Shopify location.
Use this when you want one Shopify location to receive the total stock quantity.
When multiple locations are enabled
If you are using warehouse mapping, this location will be used only when stock comes from a warehouse that has not been mapped to a Shopify location.
When to leave it empty
Leave this empty if you want to ignore stock that cannot be assigned to a Shopify location.