Lets say that the trixbox server is named asterisk001 and the vididial server is named asterisk002. (simple names right?

Lets also say that extension 2000 lives on the asterisk001 box (trixbox).
I want to define a user and phone extension on the asterisk002 box (vididial) to actuall pass the call to asterisk001. Normally this is done using the dial=SIP/asterisk001/2000 directive in the extension file.
Can this be configured through the GUI or must I define each of these manually?