All actions described above are available in the contextual menu, the
DITA submenu of the main menu and in the Author custom
actions toolbar.
A drag and drop with a file from the
Project view or from the DITA Maps
Manager view to a DITA map document that is edited in Author mode will
create a link to the dragged file (a topicref element, a
chapter one, a part one, etc.) at the drop location.