Creating and Using a Filter Subcategories
Use filter subcategories to organize long lists of filters and ease browsing.
Filters, filter groups, and filter subcategories can be used to represent naturally hierarchical filter sets, such as geographic regions, scientific taxons, and product version lists.
Use h4 for section headings
If you don't want numbers in the section headings, simply remove the "numbered" class from this block.
Note/Tip/Warning/Info blocks below are collapsed by default. If you want to use any of these, try to keep to just one per page. You may use two if necessary, but in general, try to limit these.