You can create, add to, or dissolve user-defined sets using the commands on the shortcut menu.
Select one or more faces, features, or sketches in the graphics window, or in PathFinder.
Right-click to display the shortcut menu, then click Create User-Defined Set.
Select a valid element in PathFinder or the graphics window.
Right-click to display the shortcut menu, then click Add to User-Defined Set.
In PathFinder, select an existing user-defined set.
Select an existing user-defined set in PathFinder.
Right-click to display the shortcut menu, then click Dissolve User-Defined Set.