[citron]

I would like to manage my books in the subdirectory like structure in Calibre

Example: (the -> are the name of the structure / directories)

Computers
-> Webdesing
-> Landing page optimization
Book1
Book 2

-> SEO
Book 3

And I have problem to implement Tree structure by Series, Tags or Category...

I cant add book Title to the category structure, just Author...

What is the best solution?

Thanks