HPct
Command
line: Hpct
Description:
change
points elevation, translation on elevation
TopoLT
toolbar: 
Menu:
By using this command you can translate points on. Points
(nodes) won’t be moved, only elevation text (and attribute) will be changed.
You can avoid translation for points with elevation 0.000.
If you want to set elevations of points
rates elevations of points entities then use the command FixHpct.