Now that you understand what a subdomain is, you can use the Zone File Editor in the DNS Manager to delete a non-forwarded subdomain that points to an IP address. If you want to forward a subdomain, see Forward a subdomain.
If you have forwarded your subdomain, deleting it in the DNS Manager does not delete its forwarding.
DNS can take up to 48 hours to propagate.
To use the Domain Manager to forward subdomains to URLs, see Forward a subdomain.
To work with subdomains that resolve to directories in your hosting account, see Manage your hosting account subdomains.