If you want anything.yourdomain.com to go to yourdomain.com then you setup a wildcard entry as *.yourdomain.com. * serves as Wildcard and this entry redirects anything.yourdomain.com to yourdomain.com.
In order to setup this you have to do two things:
1) Add an A record for * pointing to yourdomain.com IP address
2) Add a ServerAlias *.yourdomain.com in the VirtualHost ection of the yourdomain.com in httpd.conf