In the item screen for stands you can adjust the dimensions of the item in the top right portion of the screen, you can also change the name of the item and how it is charged and invoiced. You can input the number of open sides and the height at the bottom of the main section and under that you can add components if the item is made up of several different components.
In the item screen for publications you can input the units and change the price and description. You can also change how you charge and invoice the customer.
If you want to edit the Item click on the button