Unsolved Creating an Internal Subdomain using your external .com domain name

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Where in the vids can I find where to create a local AD domain as a subdomain of the .public COM domain?
I see that is is now considered best practice to create your local domains like this especially when you have a O365 account.

I have a small group of machines at a non profit that, because of the great pricing non profits get for MS software, I can have a local AD domain for easier management. I volunteer and try to automate all I can.

There is an AD Domain there now (.local) and that means 2 logins, one for o365 email and one for local machines, I would like those logons to be the same using the email address of the user to logon to the local machine and still be part of the local AD. I read that "Internal Subdomain" is the way to do that. Has than been demonstrated in any video?

@mike-mccormack,

I believe we cover this in the O365 (70-346) show. I cannot find the episode that I show a demonstration of this right off the top of my head. But I did find a link probably (I cannot remember exactly) to the primary source document that I probably read to figure out how to do this for the show back in 2015. The interface may have changed but it looks updated.

https://support.office.com/en-us/article/how-to-prepare-a-non-routable-domain-such-as-local-domain-for-directory-synchronization-e7968303-c234-46c4-b8b0-b5c93c6d57a7

@ronnie-wong said in Creating an Internal Subdomain using your external .com domain name:

70-346

You were of course correct - the specific URL for the episode is [https://itpro.tv/course-library/office-365-2017/prepare-ad-synchronizationo365/](link url)

I've already synced, maybe creating a new AD with the right name would be cleaner - this domain has existed since NT4 - time to freshen it up. SSO is the only think I was trying to accomplish with sync. i.e. Use thier Email address to sign on to the local domain AD. I'll miss using the phone app to reset passwords though.