We need the ability to create Universes, a way to get codex "share" from one series to another. Also it would be easier if we could duplicate a series with ALL the codex to another one (when you use the "template" feature when creating another novel it doesn't take the codex, unless you move that novel to the series, and if you nest a codex entry only to a book, it won't do the thing).
This should be a basic feature in NC already :/ I've been proposing it since I started using it.