toolbar: 

Function changes the position (XY coordinates) of the vertex of curve. It is possible to add vertices or to remove them.

Control buttons:

%                     sets elevation (Y coordinate) for next vertex according to slope

1:x                    sets elevation (Y coordinate) for next vertex according to ratio

Insert vertex   inserts new vertex (increase X coordinate, according to specified value)

x                       removes vertex

Mark vertex in situation    if user marks vertex of curve in situation, automatically marks line in the list and updates the preview curve.

You can edit all cells outside stationing.