The Remove Pressure Drop Report command is used to remove a report inserted on the drawing with the Insert Pressure Drop Report command. This will also remove the highlighting and ID tags on ducts that correspond to the report.
To remove a duct pressure drop report from the drawing, go to
Ribbon: DM HVAC->Ducts-> 
Remove Pressure Drop Report
Pulldown Menu: DM HVAC->Calculations->Remove Pressure Drop Report
You will be prompted to select a duct in the run that corresponds to the report you want to remove.
Select duct or label in run to remove pressure drop report from:
The specified pressure drop report will be removed from the drawing.