I have a website on http://jordonbc.github.io and i would like to add another domain (for experimenting on) beta.jordonbc.github.io or jordonbc.github.io/beta/ but i can't seem to get it to work.
I know i could just add another folder but that would act as jordonbc.github.io/beta/index.html instead of the others.
I have added repositories with "beta" and "beta.jordonbc.github.io" but still not working.
are you sure they are supporting another sub-sub domain? I don't think so
If you need webserver for experimenting/testing, just download xampp
I think that the only way to have multiple github,io subdomains for Github Pages is to create an organization with that name. If you have your own domain then I think you can use it for projects. Projects show up under the path of the domain for the user or organization hosting them but I think they can have their own domain if you supply it.