You can take one of two approaches:
1) Exclude audio books from your audio views by default (new views and views that inherit from Audio, the parent), but create specific views under Audio that show your audio books.
2) Exclude audio books manually from EACH and EVERY existing view under Audio, and add one or more views that you create to show ONLY audiobooks.
Which one would you prefer?
If you're sure you never want any audio books under Audio EXCEPT for only those views you create, (1) would be your best bet.
If you want to exclude audio books from not only your existing Audio views, but also any new views you create under Audio, (2) would be good.