Just go into Forwards in cPanel and create the forward and tell it where to send it. If you don't create an account for the forward no email will be stored.
I use this feature heavily. When I sign up for something I create a forward for it to my real email address. Once I get the messages I want, I delete the forward. If anything else is sent to the forward email account it just goes to never never land and I don't get spammed with it.