Configuring a category template to sub-divide for child categories

The ability to make a series of child categories that are nested under a parent category comes in handy, and the fact that when you call the parent category all posts from the parent and children will appear is handy too. I have often wanted to see how to further refine that so that the presentation was sub-divided by the children … so I sat down and found a way to get there and here it is:
I have a couple of things left on my wish list:

  • linking the sub-category name to a sub-category only archive (although this is of questionable value)
  • finer control over sub-category sequencing (pretty picky huh?)
  • It was a little surprising how little info is out there on this procedure, but here are some articles that contributed to solution above: