Move a document up or down in a sub-tree
You can easily move selected documents and sub-trees up or down within a specific sub-tree in a map.
The map must be locked.
        Use the buttons at the top of the DITA Map view and DITA Map Editor to move documents
                up or down.
        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.