change i hosted domain to a subdomain

Have an old site like http://www.xyz.com and is only site in Apache conf
on i

Need to change it to add a subdomain "abc" to url so that it works as
http://abc.xyz.com

- and http://www.zyz.com will be hosted elsewhere



Network tech said it should be easy configuration change, but he doesn't
know Apache.

Reading the docs it seems this is either "virtual host" (there is not an
existing virtual host

or "RewriteEngine" in Apache.. Or both?

Do not want to have to change all the urls written by the cgi programs.



I haven't changed the Apache config in many years.

This is V7R3, and firewall and dns are external to system.

Power i only has a local 192.168 address.

Apache is only webserver, no Websphere or Tomcat.



Jim