@NadiehBremer Oh yeah!
There's no way to do that automatically via the Netlify admin UI, but you can serve each site on Netlify, then gather them together in your main site via redirects. You'll need to take care of your root URLs in paths, of course.
I recommend a netlify.toml for configs
My tweets and posts live here on my own domain these days.
You can explore them here and follow me on Mastodon instead of Twitter where I'm not currently active.