You can now delegate a subdomain to Netlify DNS without having to bring over the apex domain, allowing you to manage subdomains like app.example.com while leaving the primary domain on your existing DNS service. This move provides several benefits, including easy branching for multiple environments, automatic SSL certificates, and improved content delivery network (CDN) performance. To set up this feature, you need to ensure your domain registrar supports NS records on subdomains and then follow a few steps in the Netlify UI, which may take 24 hours or more to propagate. The new feature is based on customer requests and invites feedback from users.