Mahesh, From what I understand, you are asking for multiple levels of notebook stacks. Evernote does not support it. You can only have notebooks in a stack, you cannot have another stack inside a stack. Thanks, Max
Mahesh, Yes, you can have more than 2 notebooks in a stack. Just right-click on the stack and choose "Create Notebook in ..." For existing notebooks, just drag the notebook onto the stack. Thanks, Max