The Sets window is a dockable window, which displays both selection sets and search sets available in your Autodesk Navisworks file.
The selection sets are identified by this icon: 
, and the search sets are identified by this icon: 
.
You can customize the names of selection and search sets, and add comments. You can copy and paste names from the Sets window. To do this, right-click an item in the Sets window, and click Copy Name on the context menu. Alternatively, you can click an item in the Sets window, and press CTRL + C. The name is now copied to the clipboard.
You can also show the selection and search sets as links in the Scene View. These links are created automatically by Autodesk Navisworks. Clicking on a link restores the geometry within the corresponding selection or search set to the active selection, and highlights it in the Scene View and on the Selection Tree.
You can use the buttons in the Sets window to create and manage selection and search sets in the Autodesk Navisworks file.