Creating surface within a closed curve.....

[Aristotle]

I am not able to make a surface within a closed, continuous (C1), non planar curve. If I use the boundary command it says lines are tangent (make it non-tangent!) I'd like to select the boundary and...make the surface. Is It possible to? Can some tell me the procedure shall to use. Thanks in advance.

[Abraham]

Split the "region" with a curve then create two boundary blend surfaces.

[Aristotle]

Hi Abraham, Thanks for the suggestion, I will try it.