I remembered reading about the enhancements to view references in Revit 2013. View references are usually used in plans to divide large floor plates into smaller part plans in order to fit on a sheet. In 2013, they can be used on many other view types - including legends.
To create a view reference in a legend view, find the Tag panel in the Annotate tab of the ribbon. Click on View Reference. In the figure below, I am using the default view reference family and I simply drew a detail line to indicate the section cut plane in the legend view.
When you start the View Reference command, you will need to select the view you wish to reference. In the contextual ribbon, use the View Type drop-down to filter for a particular type of view, such as Sections. Then select a view from the Target View drop-down.