Keystroke: Alt + d
The DBT Document menu allows you to apply settings that are stored with your document file. The Document menu is initially set by the template you pick when you first create or import your file. Only your current document is affected by the settings you make in this menu. The template itself will not be affected, nor will other documents created with the same template.
The Document menu also contains commands that allow you to create custom Templates, so you can preserve all the settings in the menu for later use.
The items in the Document menu are discussed in sub-topics in this section of DBT Help: