Help With TOC (mid-topic links)

Hi All

I'm reasonably new to RH (using 2015). I've got all the basics down but now I'm trying to improve navigation.

When I auto-generate my TOC, I get all the topic pages, but I'd like to add further links within the page. From reading the incredibly sparse documentation, it seems I create bookmarks in the topic and then leave "Create TOC pages for mid-topic links (bookmarks)" checked, when I auto-create the TO

I clicked to the left of my heading and selected insert bookmark, then I auto-generate the TOC but I get none of the bookmarks in the TOC. Have I missed a step? Isn't there a way (like in Word) where you have it generate TOC from heading styles (e.g. Heading1,2 and 3)?

Is there a decent tutorial on bookmarks and hyperlinks?Thanks

Mark