Here are the steps to create a DITA map are the following:
Go to menu
New toolbar button.
or click on the
Select one of the DITA Map templates on the tab From
templates of the New dialog.
Click the OK button.
A new tab is added in the DITA Maps Manager
Save button on the toolbar of the
DITA Maps Manager view.
Select a location and a file name for the map in the Save As