You could have multiple separate source documents (or even a single source document with bookmarked ranges) and use INCLUDTEXT fields to incorporate the source material into a target document. I don't believe you'll find this a significant improvement on what you already have, though. A better approach might be to have a template with the minimum required boilerplate text and however many autotext entries you might need for adding standard additional texts (that may or may not require further editing). See Word's Help file for advice on both approaches.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]