The way the macro works, you would need to add the new column to the workbook between the existing two columns for the content controls that are already being captured. And you'd have to do that before running the macro on those documents and after you have finished running it on all documents lacking the new content control.

That still doesn't address the issue of which 'duplicates' you want to keep/discard.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]