If you want the map to be a submap, you can create it the
same way by right-clicking the place in the current map where you want to add it (in the
DITA Maps
Manager) and selecting New from the
Append Child, Insert Before, or
Insert After submenu.
Select one of the DITA Map templates from the
Framework templates folder.
Click the Next button.
Select a parent folder and the file name and click
Finish.
Save the map after opening it in the DITA Maps
Manager or the Editor.