While trying to add a sub-domain through cPanel, the following error occurred :
Error from domain wrapper: my.domain.tld is owned by another user.
This happens if cPanel did not remove the entries correctly when you deleted the sub-domain.
Check and remove the entries for the sub-domain from the following locations :
1. Remove any entries pertaining to the sub-domain in /var/cpanel/userdata and /var/cpanel/users
Note : Do run /scripts/updateuserdomains because you are editing the file manually.
2. Remove the sub-domain entries from /var/named/domain.tld.db
3. Remove the VirtualHost entry for the sub-domain in /usr/local/apache/conf/httpd.conf
4. Remove any entry for the sub-domain in /etc/named.conf
Once these are removed, you should be able to add the sub-domain through the control panel.