Use this dialog box to edit the elevations and grades for feature line, lot line, or survey figure segments to either a constant elevation or a constant grade.
Select Constant Elevation to modify the points to a constant elevation. If no rows are selected it flattens the entire feature line using the elevation of the start point. If some rows are selected it flattens just those using the elevation of the first selected row. Select Constant Grade to edit the selected rows to a constant grade. The entire feature line grade is modified if no rows are selected. It holds the start elevation and the end elevation and sets the points in between to the same grade, in effect eliminating the grade breaks.
Select Constant Elevation to select multiple rows for editing with the Raise/Lower commands.