Thanks for the Valuable feed back. Yes, have read other articles too about these hierarchical system demand from Evernote, and this is in demand from long back. I have just joined the forum and came to know about this demand but I think forums are made for this purpose only to provide your feedback on new features or any technical issues to the developer, now this is our feeling for a better and cosy system in an app or for an app. Hope they may feel these as a necessity or one has to mould as per the app or if he doesn't meet the required then better to shift to some other system or app.
I am using this app since 2012 but was not a active user due to this hierarchical system, but when they introduced stack and Task within the Note, with all tasks consolidating to a single Task page, made me shift all my notes from other apps to this app. And during this process I felt of Sub-Stack.
Hope Developers may understand the need of time.
Thanks Gazumped.