Just like tasks, items contain rich information. You can control what information to see by clicking on the Show Columns link.
Items can be prioritized by moving them around through drag and drop. Typically, higher priority items are at the top.
You can create a new item by typing in the Search or Create Item entry at the top. It is a dual purpose input. As you type, Planbox searches existing items matching the works you typed. You can jump to an existing item by clicking on it. Or, if you really want to create the new item, click on the (+) button or press Enter. The new item gets added to the top of the list and the Item Pane opens up.
The Status button allows you to change the status of the item. In addition, you can duplicate or delete the item from here.