Reply To: Tasks and Guides
It’s sort of possible, but not recommended! You’d need to include manual links to the lower levels within the content.
The design of the “How do I?” section is to provide quick answers, ideally on one page, or on several pages if necessary. You’d be better setting up your handbook as hierarchical “pages” using the “Page with left-nav” template which supports unlimited levels.
Even better would be to create individual tasks in the “How do I?” section for each item of your handbook and categorise/tag accordingly.