TMG 2010 URL Redirect

My client has a site comprising Forefront TMG2010 and Sharepoint 2010.

They have published their sharepoint environment to the internet through the TMG server.

They want the following redirect to take effect:

External user types in
After authentication, user is directed to  (this is a sharepoint sub site).

The Global Link Translation feature in TMG does not appear to be able to do this as it redirects to  (it basically splices in /sites/centraloffice into the url)

Can TMG do this?
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Microsoft Forefront ISA Server

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