Some schedule types offer an insert data row command. Room schedules show it but it does nothing. (ie. R2019.2.6, later versions may differ). The idea would be to offer a duplicate data row command for every schedule. Duplicated items would get a new (unique) mark value but would otherwise have the same values as the copied row. All values not currently listed would remain empty (if possible) or get their values from Revit if the element has a base level for instance or copied wall's height value cannot be zero even if that parameter was not scheduled.
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