How to use existing Netlify DNS for secondary project

I had a project, I have set Netlify DNS on that project for my custom domain. For example custom-domain.com

Now I created a second project, and I want to connect this project to sub.custom-domain.com. How can I do this?. I tried to add a CNAME but it did not work, it shows netlify not found page.

I solved it, you just add the domain and click the option for configure later. Then it configures automatically. But it would be nice that ux for this be more intuitive.

Glad you found your solution! Thanks for coming back and sharing this with the community. :partying_face: