sectionid	sectionclass	parent-id	number	title
l-3	h4	section-types	3113	Level three

A Subsection of a level 3 will look like this

{% highlight yaml %}

sectionid: UNIQUE-ID sectionclass: h3 title: TITLE parent-id: UNIQUE-ID-Of-PARENT

{% endhighlight %}

So the parent-id is where you will reference the anchor of the h2 section that's your subsections parent.

Level 3 sections can have children, the variable to use is the same. To have children add

{% highlight yaml %} is-parent: yes {% endhighlight %}