I'm sorry. What I mean is that Cpanel is a web interface that gives just about complete control over the domain.

In the email manager, there is a forward feature, which bascially just allows you to enter a forwarding address for a chosen email address.

You can tell the form what email you want to forward from your domain name, and enter a forwarding address. You can also choose to pipe it to a script, by entering the pipe and path: |/path/to/script.pl instead of an email address.

Either way, Cpanel, the software that manages the server, puts that entry into your /etc/valiases/domain file.
Such as this:
It adds a line such as this:

email_addy_to_forward@domain.com: |/home/path/to/script.pl
[download]

or:

email_addy_to_forward@domain.com: myotheremail@domain.net
[download]

Whatever you enter into the form in your control panel(cpanel).
thx,
Richard