1 . Click on Edit Tree to edit this tree before being able to add items on it.
2 . Click the Add Root Branch to create a new branch on the Tree Items (1), then from the available devices and graphs column on the right, select the items you want to add into the branch (2,3). Repeat for any additional branch you need. Once completed, click on the Publish check box to make it available to all then the Save and Finish Editing Tree button to close the editor (4).