Creating a subdomain for a site not hosted on Netlify

Hello!
Here’s the info:
Netlify site name: crossfitmazamet.netlify.app
custom domain: crossfitmazamet.fr
Domain registrar: OVH

This site is hosted on Netlify, and I have setup Netlify DNS without trouble.

Now, another developer has created a shop for my site, which I’d like to point to a subdomain, like shop.crossfitmazamet.fr. That shop is most likely not hosted on Netlify.

This is the first time I’ve done that, and all the documentation on Netlify actually got me more confused than anything else.

if possible, I’d like to have Netlify DNS handle that, and reading some docs, it seems that it’s possible. I’ve read Delegate a standalone subdomain, but it looks like that’s only for sites hosted on Netlify.

Do I need to go to `teams/[myteam]/dns/crossfitmazamet.fr and add a new record there? If so, how do I fill in these fields? Where do I write my subdomain name of choice?

Thank you for any help you may give!

Edit: After posting this, I saw a post that seems to help me figure things out. This one hadn’t come up in my netlify forum search, but only in the Suggestions below my post. Will delete my OP after the process.