How do I forward a domain's visitors to another (both sites being owned by myself and hosted on Dreamhost)

I have some sites registered with Dreamhost. I am trying to find out how to forward visits to one of those sites, to another of my sites.

I’ve gathered so far, that this might be called domain forwarding (different to redirect?).

I’ve tried googling and perusing the Dreamhost forums, but can’t for the life of me find out exactly where it says how to do this, so I thought maybe Fluther would prove faster than wait for Dreamhost support to help me out.

So, how do I forward one domain to another, within Dreamhost? (Note: these two domains are on the same account at Dreamhost.)