As an example, the attached has a lofted surface made from 4 arcs drawn on your original. Here's a copy of the command-line to make such:Command: LOFT
Current wire frame density: ISOLINES=4, Closed profiles creation mode = Solid
Select cross sections in lofting order or [POint/Join multiple edges/MOde]: 1 found
Select cross sections in lofting order or [POint/Join multiple edges/MOde]: 1 found, 2 total
Select cross sections in lofting order or [POint/Join multiple edges/MOde]: 1 found, 3 total
Select cross sections in lofting order or [POint/Join multiple edges/MOde]:
3 cross sections selected
Enter an option [Guides/Path/Cross sections only/Settings] <Cross sections only>: g
Select guide profiles or [Join multiple edges]:1 found
Select guide profiles or [Join multiple edges]: