I have searched and searched, both WordPress forum as well as googling this... the only results are people asking the same question but nobody has yet answered.
I am going to have a few blogs on various subdomains and I typically find myself customizing the theme files for various reasons. I modify the templates locally so I will have what I want prepared for upload to any given blog. But this is so wasteful as I then have to upload the theme several times, and aside from that of course there are many copies of the same files just to have them on each blog!
I want to have ONE folder containing the theme templates where WP looks when it lets me peruse my available themes.
I figured I'd have to change a parameter somewhere for exmaple called "themes_folder=" or something like that, where I could use a URL to direct it where to look. Is this possible? It is very frustrating to have to modify the template and upload it several times to different locations all the same files. I not only spend more time doing this chore, but use up more space on my host.