Hi,
First you may have a parameter for the ducts like "RiserNo" and you may load the data of 3,4 and etc to the related ducts.
You may than duplicate an existing duct tag and in family editor you may add KX as text (if it will change for different risers this can also be a parameter). And you can add the RiserNo parameter to the tag.
So this way you can tag the vertical ducts on plan view and they will be exactly same as you shown.
I do not know how much you use tags, if you need I can help you on this if you tell the version of Revit you are using.
Hope helps...
Daniel Kazado
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