This list is only visible when the Elements and Property Sets lists are active. It provides a list of possible uses or outputs for your document, allowing you to apply property settings for specific uses. By default, this field is set to Base (All Outputs). When Base (All Outputs) is selected, any property settings you specify are applied to all uses of the document. To apply property settings for a specific use (or output), choose an output format from this list.

You can also combine uses or remove them from this list by selecting <Edit This List> to open the Edit Uses List dialog box. Combined uses allow you to set properties for more than one use. Combined uses are saved with your stylesheet.