Hi Rajesh,
To add new branches, right-click on the branch which you would like to insert a new branch under and click "Add". For more information on constructing the tree structure, please review the following help pages on how to edit the LEAP tree and an overview of the different types of demand branches. For example, you may want to use a "Category" demand branch for sub-sectors and end-uses and a "Technology with Energy Intensity" demand branch for all devices.