Feature Request: Notebooks within notebooks (Tree-like structure)

Dear Zoho!

I already migrated all my stuff from Google Keep, Im really fond of Zoho Notebook so far. One thing that could make the service much more powerful is multi-level notebooks (or tree like structure). For example, entering into Notebook named "Personal", you could see notes, but also "sub-notebooks" like "Home","Cooking", etc. which could also contain notes and sub-notebooks. This could make organizing information really powerful and easy (as far as I know many similar apps make use of this hierarchical notebook).

Keep up the good work, lovin' the service pretty much!

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