Staging a plane to the surface

Revit
1

I have a curved surface such as a file. Please help me flatten it out so I cut CNC
https://drive.google.com/open?id=0B7fGruH1749-ZVBPT2hYQjhNMjA

help 1.PNG759×556 13.8 KB

2

You could try with DynamoUnfold package and try to Unroll it.