If you do not have enough stock to fulfill your order, the option Create backorder activated will let put the other items on back order.

If you have multiple locators configuration, when delivering select an item to open the window Product information.

You must check the box and capture the quantity to be delivered and click on Save for every product.

In cases when you enter the item lot, when delivering you'll see the lot number and the expiration date. You must check the box and capture the quantity to be delivered depending of the locator and lot, and click on Save for every product.