Demote a document in a map
You can easily move selected documents and branches to a lower level in a map's hierarchy.
The map must be locked.
        Use the buttons at the top of the DITA Map view and DITA Map Editor to demote
                documents within a map.
        Note:  If you move the parent topic of a
                    sub-tree, all the child topics move with it. 
            Tip: You can use the
                CTRL+Z and CTRL+Y shortcut keys to undo and redo moves within a map.
        