VIAVI TestCenter: Is there a way to mark a packet as dropped and not depend on the sequenece number in the VIAVI signature field?

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VIAVI TestCenter: Is there a way to mark a packet as dropped and not depend on the sequenece number in the VIAVI signature field?
VIAVI TestCenter calculates dropped packets based on the VIAVI signature field.  We do not have any other option to mark them as dropped.