Rather than customising a secondary template for each user, in the past I've done this by using a macro to write user-specific information to their registry and then the templates read this as new documents are created.

Office addresses would be configured as entries saved as building blocks and the preferred office name/id might be stored in the registry. This would allow users to move between offices and change locations in the document and still retain a 'default' office location.

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Andrew Lockton
Chrysalis Design, Melbourne Australia