Im presuming your stl is closed, no tears or openings in quilt. And you want solid that has surfaces/edges that you can select or manipulate.
Opening closed stl in Creo should automatically give you solid but no way to select edges/surfaces.
There are several ways to do this. Usually it is done in Restyle mode.
But if model is not too complex you can do it using Freestyle.
Stl must be saved to obj file first.
Reconstruct from facets in Freestyle can be also used.
https://youtu.be/TMdV9rRYARE