Edit Named Selections displays the Edit Named Selections dialog, letting you manage named selection sets of sub-objects . Unlike the Named Selection Sets dialog, which applies to objects only, it is a modal dialog, which means that you must close it in order to work in other areas of 3ds Max. Also, you can work only with existing named sub-object selections; you cannot use the dialog to create new selections.
To edit named sub-object selections:
The Edit Named Selections dialog opens, listing all named selection sets for the current sub-object level.
The dialog window lists all named selections at the current sub-object level. The buttons beneath the windows let you delete, merge, and edit the listed items. Use standard mouse-plus-keyboard methods (using Ctrl or Shift) to highlight list items and designate them for subsequent operations.
To rename a set, click it in the list, and then edit its name in the one-line window immediately below the list.
Removes the sub-objects contained in one selection set from another. Select one item in the Named Selections window, and then select the other. The top highlighted item in the window is operand A, and the bottom is operand B (regardless of the order of their selection). Click Subtract (A-B) to subtract the sub-objects in the bottom item from those in the top item. There must be some overlap between the two selection sets for this command to have any effect.