One way to accomplish that would be to apply the administrative update to your installation point then use a management tool to invoke the client updates.
See this section of the Office Resource Kit for details
http://www.microsoft.com/office/ork/2003/five/ch18/MntA01.htm#top

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Athena [MVP]
> I am using group policy to assign installations of Office 2003 to our
> workstations on the domain.I am wondering how to add the office updates to
> the installation point. Is there a step by step guide on how to do this? I
> am confused.