Expanding multiple levels in book navigation

Howdy,

The guy that usually handled our Drupal stuff isn't around any more, and so the task has fallen to me - but I don't know much about Drupal.

I have a question about organizing book pages further. Currently we use a book to manage our FAQs, but it looks something like this:

FAQ1
FAQ2
FAQ3
...
FAQ35
...
FAQ50

... and so forth. Obviously, this looks very messy, and I'd like to display the FAQs grouped under headings like "General" "Troubleshooting" etc. The only problem is, when I add a book page, like General, and put FAQs 1-10 underneath it, the navigation on the first page of the book shows "General" as a category, but it's collapsed. If I want to see the links under General, I need to click on it and visit that page to see its child pages.

What I want to do is make it so that the main (first, top level, etc) book page has a visible menu structure like this:

GENERAL
--FAQ1
--FAQ2
--FAQ3
CATEGORY2
--FAQ4
--FAQ5
...
CATEGORY3
--FAQ35
--FAQ36

...and so forth.

Is there any easy way to achieve this?

Thanks in advance for any replies!