There is one password-unlock per ebooki.e. you could unlock all or part of the ebook on entry of password, but you could only do it once
Therefore maybe do your stuff as 3 ebooks, each one separate EXE with separate password
Other idea, I am currently using on my own is to share stuff between ebooks
e.g.
For Book 1 - I have 2 "editing" folders, stuff unique to book 1, stuff shared in the Big ebook
For Book 2 - I have 2 "editing" folders, stuff unique to book 2, stuff shared in the Big ebook
By "editing", I mean folders where I create/edit the HTML code.
I then have some batch files (outside the compiler) to copy stuff around
e.g.
BatchBook1 - copies Book 1's 2 folders to Book 1 source folder
BatchBook2 - copies Book 2's 2 folders to Book 2 source folder.
BatchBigBook - copies the shared stuff from Book1 and Book2's folders into BigBook's source folder.
Run the batch file, compile the ebook, and I still only have 1 original copy of each HTML file, but also have temporary copies just to compile if that makes sense
For disabling ebooks, go look over old threads about hyperlock in this forum.