change a domain to a subdomain webmin

[YuGiOh]

change a domain to a subdomain webmin and apache In apache, create virtual host for your subdomain.

i using the domain now i need to change it to a sub domain Can you please explain a bit more ? ok
im using my domain now i like to chenge it to my sub domain
my domain.info to my sub domain --->>subdoamin.info
change in webmin and apache Transfer domain to subdomain on same server