I want to add a subdomain to the netlify site without changing the nameserver since the main domain and other subdomain is using Wordpress sites. Documentation regarding adding sub domain suggest to replace the nameserver and use only netlify nameservers.
Is there any other way to add only a particular subdomain to the site?
Thanks for reaching out and welcome to Netlify’s Support Forums!
I do see you have Netlify DNS setup here, however, your name servers are set to namechaphosting.com instead of Netlify’s.
If you’re not planning on using Netlify’s name servers, you’ll want to remove the Netlify DNS zone here.
You would instead configure the subdomain project3.trushargavit.com with a CNAME Record that points to lumen9.netlify.app. The docs @jasiqli mentioned here should get you sorted. If you still have the CNAME Record created as shown in your screenshot, then it should be setup, however it hasn’t propagated.
Since the DNS Zone is not currently configured, you have an inactive DNS Zone which can cause issues with provisioning the SSL Certificate. You can read more about inactive DNS zones in this Support Guide which describes that issues that an inactive DNS Zone can cause and how to fix it.