Thanks for the quick response. I really appreciate the help.
I was looking for files, not directories. I fear I'm not quick on the up-take. Obvious now.
However, I'm wondering if I can just copy just the WordPress items to the main directory? I've been using the site for a year with old HTML files, some of which I auto-generate/update for my weather station. I have other pages stored there that I don't want/need to convert to WP.
Would it be easiest to copy the directories and files from the main domain that I wish to continue to sue to the subdomain, before following the above instructions?