The Split Orders extension gives you the power to process and ship part of a customer’s order separately. You can choose the quantity of each item to be split to a new order, assigned to the same customer, with matching shipping and billing details.

Use cases
With split orders you can respond flexibly to different situations with orders, including:

When you have an order which is only partially ready to be shipped, or contains products on backorder. With the Split Orders plugin you don’t have to keep the customer waiting — split the delayed items to a new order so that you can ship the products you have available.
When you use different couriers for different parts of an order and want to attach tracking information for each shipment. Split the order to match shipments and attach tracking information to each order using Shipment tracking.
When the customer asks you to ship part of an order to a different address. Split those items to a new order, update the shipping address, and process each order separately.