Hi Kshitiz,
Hmm - LEAP should not allow you to add demand categories (yellow folders) beneath categories with energy intensity (green folders). Only technologies (grey gear icons) can be added underneath green categories. I expect this is related to your inability to switch units. Can you tell me how you created your demand tree with yellow categories underneath the green categories?
Also - I notice you are using LEAP 2015.0.17.0. The latest version is 2017.0.5.0, which introduces a number of new features as well as important bug fixes. I'd recommend that you always use the latest version, which you can download here:
https://www.energycommunity.org/default.asp?action=download
Taylor