@Pushpak
You may find this useful:
https://discourse.shapr3d.com/t/3d-mountain-range/7051
Remember Lofting requires every shape to be a Closed Shape
Sketch the Contours on the X-Y Plane
Select all but the Largest Contour and use Transform > Move/Rotate to elevate them along the Z Axis
Deselect the Larger of these Contours and repeat as required.
Remember Multiple ‘Peaks’ cannot be Lofted at the same time.