Is there way in ArcEditor (10.0) to adjust all the vertices z values by an offset? (translate in z axis?)
I have many polylines which need to be lowered (eg: subtract 1m from every vertex z-value).
You could look at the Adjust 3D Z Geoprocessing Tool.
The help mentions
adjust_value : A value to apply to all Z-values. To decrease the Z-values for the entire feature class, enter a negative number. To increase, enter a positive value.