Hmm.. well for example, section "Work", subsections "Project1", "Project2", "Project3", "Project4".
When you're sure that it won't be possible for a note to belong to 2 projects simultaneously, this setup starts to make sense.

Maybe that's because switching between notebooks is now less than perfect..  Probably a better way would be move section tabs to the right (or left, or bottom), and use the top row for notebook tabs, as requested in this (quite popular btw) request.

Hi Sven,
thanks for the input. Indeed tags would make more sense for the given example (I copied the text from a suggestion email I got), but nevertheless subsection could be useful for other scenarios.

Thanks for your comment! This feature is quite high on our list, but unfortunately some other features are higher. But if you drive more people to this page and get them to vote, it can change things ;)

Hi Noah, thanks for the suggestion!
I agree with Thomas - please take a look that that idea, btw it already has a lot of votes and is thus quite likely to be implemented soon.