CADWorx Plant II tab: Dimensions > Set 
Plant menu: Utility > Elevation > Set
Command line: ELEV
Places piping at a preset elevation. This is the standard CAD platform Elev command.
When using this option, remember to place the elevation back to 0'-0" for the proper
elevation placement of all future components. Use this command with caution. An alternative
is to use the Flat 
command built into CADWorx (VIEWFLAT).
Refer to the CAD platform documentation for complete details regarding this command (ELEV).