I am not aware of such an option in WHM. However, you can do it manually by editing the DNS zone for the domain, and editing the IP address for the virtual host in httpd.conf.
It is quite safe to edit httpd.conf. You should obviously take care to not mess it up 
In this case, you need make a very simple change: replace one IP address with another. There is not much risk in that.
PS: Remember to restart Apache (from WHM or in the shell) to have the change take effect.
In this case, you need make a very simple change: replace one IP address with another. There is not much risk in that.PS: Remember to restart Apache (from WHM or in the shell) to have the change take effect.
Isn't there a local template file that should instead be changed so that his httpd.conf changes don't get overwritten by the next conf file rebuild?It is quite safe to edit httpd.conf. You should obviously take care to not mess it up
No, it is not like Exim where the config file is overwritten by cPanel updates and one should rather use the template in WHM. In the case of the Apache configuration, cPanel (WHM) adds lines to httpd.conf only, and never recreates it from scratch. Any changes you make, are left in tact.