watsermetjou:
I don't see a way to do this, and the
Parameter Transfer Between Objects won't work as the MEP pipe and duct objects are not the same subtype. The best solution I see is to use the existing pipe layout as a guide for recreating the run using ducts with the MEP Routing feature.
You should edit your Signature to include your
ArchiCAD version for more accurate help in this forum.
David