You can do this via INCLUDETEXT fields. First, create and save a stand-alone questionnaire document. Then open the first target document and navigate to the questionnaire portion. Delete the existing questionnaire, then insert an INCLUDETEXT field via Insert|Quick Parts|Field, supplying the full path and name, with \\ for the path separators. Your documents will now be linked. You can copy the INCLUDETEXT field from this document and paste it into the others, thus linking them also. From now on, any changes to your questionnaire document will be reflected in each of the target documents.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]