In QuickBooks Premier and Enterprise Solutions, in order to use Sales Orders, you first have to enable them in Preferences.
To do that, choose Preferences from the Edit menu. Next, choose Sales & Customers from the Preferences menu and check Enable Sales Orders. Once this preference is selected, you can configure how QuickBooks handles sales orders. A screen shot from QuickBooks Premier 2009 appears below.
Note that QuickBooks Pro and QuickBooks Online Edition (both Basic and Plus) do not support sales orders or back orders. If you need support for sales orders, you’ll need to upgrade to QuickBooks Premier or Enterprise Solutions. To review the features of QuickBooks products, see our related article on the feature differences between QuickBooks Pro and Premier or the product descriptions at our Buy QuickBooks page.