Changing an Add-On Domain to Primary Domain

Not sure but the following Codex page might help:

https://codex.www.ads-software.com/Changing_The_Site_URL

That is helpful, but its a slightly different scenario as the URL of the blog is not changing, but the domain is going to pointed to the public_html file instead of the add on domain’s directory.

I really think this is just about this: https://codex.www.ads-software.com/Giving_WordPress_Its_Own_Directory

But as its a big site I’d rather hear this from Otto or someone who is really in the “know.”