A format definition can contain only one format element. When you add a format element to a format definition that already contains a format element, a message appears asking whether you want to replace the old format element with a new one or not.
To create a format element, follow these steps:
Apart from creating a format element for a format definition, you can also create format elements for compound format elements. In the Outline view, right-clicking any compound format element allows you to add a format element to that compound format element.
By adding format elements to a format definition you form a format hierarchy.