The Open Positions module allows you to see all unshipped positions at a glance.
The Open Items view is located under Sales → Order. Only items from orders are displayed in this list.
Clicking on the pencil icon on the right side of a table row will take you to the detailed view of the associated order. There you can select what to do with the order via the Action-menu. You can for example create a partial delivery or continue as a delivery note.