You can use elevation grips ( 
) to modify the elevation of HVAC MvParts and duct segments as you connect them to existing duct runs in side and isometric views. Elevation grips on HVAC MvParts are displayed at their insertion points and connector points. Elevation grips on a duct segment let you modify the elevation relative to the top, centerline, or bottom of the segment.
If the part or duct segment is connected to other objects, you must specify whether you want AutoCAD MEP 2023 toolset to maintain their connectivity when you modify the elevation.
The following illustrates changing the elevation of a duct segment.
Elevation grip on duct segment selected
Activated input field