Email forwarding is used to send all the emails from one address to another. This is also called email alias or email redirect.
Login to cPanel and click on "Forwarders" in the EMAIL section
You will see a list of the already created forwarders. You can't edit a forwarders but you have to delete it and then create a new one.
You can add a forwarder for only an address, or for every domain address.
After you click on "Add Forwarder" you can specify which address you want to forward and set a destination address