You will then be prompted to enter in an elevation to add to label
values. Often times elevations are abbreviated to save time and
space. If every elevation in a drawing is in the 500s instead of
labeling every elevation 539.97, 540.02, 540.11 sometimes, like in
the example on the side, they are listed as 39.97, 40.02, 40.11.
This command allows you to add a given amount, such as 500, to
every label elevation to produce the correct elevation in the
drawing. This command will assign elevations from the labels to
nearby vertices. If vertices do not have a close elevation label
than they will be interpolated from vertices that are nearby
elevation labels. The vertices elevated in this command will appear
as control vertices in the command Edit-Assign Polyline Elevations.
It can also be used in conjunction with other 2D to 3D commands to
elevate polylines by more than one method.