There is no way to link the custom document properties in one document to custom document properties in another. If all the documents are in the same folder (and there are no other documents in that folder), Graham's code can be used to propagate the custom document properties that are input into the macro to all of those documents. If you need to replicate the custom document properties in the activedocument to just a selection of other documents, that can be done via hard-coding those documents' names into a macro or by providing a dialogue box one can use to select the documents. You need to specify precisely what your requirements are.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]