How to display terrain lines at an offset (LHS & RHS) from the centerline in the "Design Profile View" ?

While designing the profile, I need to display the following in profile view: - 

1) Terrain at 25m LHS and 25m RHS from the Design Centerline. 

2) Terrain at Design Centerline raised by 2.1 meters.

3) Profile of a 3D line (For example, centerline of a parallel road).