Are any items unavailable in order, and do you want to ship the orders partially? Then you can ship orders with available items with the help of partial shipment feature. Follow given below steps for that, 

Steps :

1. Click on order Name
2. Then click on More Actions button, Click on Ship Order option
3. Select logistics and scroll down little bit to select order item, click on process button
4. Select measurement and location, Click on ship button
5. Pop will show you AWB number 

Now your order will be moved to the partially shipped tab from there you can again ship remaining items by following the same procedure.