Help Files?

Factual Questions
#1

Let’s say I want to write something that would begin with a heading. By clicking on that heading, one of more sub-headings would open; by clicking on one of those sub-headings, one or more sub-sub headings would open, appropriately tabbed.

I would prefer to organize this “something” like a help file is organized and not like a conventional table of contents-----is this feasible? Is free software available to help me do this? I’m not expressing this very well because I’m not entirely sure how to express it.

Cooking Cats: (click on this)

Cooking Adult Cats: (opens as a result of clicking on "Cooking Cats")

 Cooking Kittens: (Opens as a result of clicking on "Cooking Cats")

         "How to French Fry Kittens" (Opens as a result of clicking on "Cooking Kittens"

But with each click, the previous heading remains visible; I’m not jumping from one heading to another; I want it to appear as a progression.

I must be insane.

#2

There are lots of tools out there you can use to write Windows Help files that work just like the help files you see in most Windows applications. I think what you describe can be done.

Try to Google “writing windows help files”.