Forming surface bounded by projected trimmed sketch

[palxnder]

I am attempting to form a surface area that is defined by a sketch that has been projected on a cylindrical surface.  Ultmately this would be a cylindrical solid with an indentation that i can form.  I have attached a file that is a cylindrical surface that has been trimmed by a projection of a circle on the cylinder.  Is there any way to modify the shape of what surface is left without changing the projected curve?

[WHolzwarth]

Perhaps this will do.

[palxnder]

Thank you for the example Betreff, but is it now possible to alter (form)the shape of the surface created while maintaining the position of the boundary? 

[WHolzwarth]

You can edit both the rotation surface and the basic sketch of the trimming shape.

[TrippyLighting]

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a@palxnder wrote:

Thank you for the example Betreff, but is it now possible to alter (form)the shape of the surface created while maintaining the position of the boundary? 

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Can you provide a visual example of what you are trying to achieve?