This command allows you to convert a 2D polyline to a 3D polyline by specifying the starting and ending elevations of the polyline. All intermediate polyline vertices elevations are linearly interpolated from these end point elevations.
Select polyline to assign elevations:
Enter starting elevation: 109.85
Percent/Ratio/<Enter ending elevation>:
112.16
Select polyline to assign elevations (Enter to End):
press Enter
Pulldown Menu Location: 3D Data > 2d to 3D Polyline
Keyboard Command: 2dto3dpl
Prerequisite: A polyline
File Name: \lsp\poly3d.arx