Your workbook is not configured correctly for the tutorial's 'Using an Extra Field to Generate the Trailing Content Per Group' example. In column E you need a formulas like the ones shown in column E of the tutorial's sample workbook. Indeed, you could use exactly the same formulas ... Simply copy & paste E2 from the tutorial's sample workbook into E2 of your own, then copy that down as far as needed.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]