We’ve just updated our Bulk Editor app to let you edit the fulfillment service for products. The fulfillment service is a third-party warehouse that prepares and ships your orders for you and is often used if you’re dropshipping your products. Shopify comes with several fulfillment services built-in and the ability to add custom ones as well.
With the Bulk Editor app you can edit the fulfillment services for a collection of products. For example, you can set all products from a specific vendor to be fulfilled by Amazon: