How to loft a plane proportionally along a curve into a surface

Civil3D
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How to loft a plane proportionally along a curve into a surfaceCAD

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Hi and welcome to the forum.
Can you be a little more specific? What have you done so far? Any screenshots or you can upload and please share your graph…
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And if you can’t upload any files due to restrictions as a new community member, please use any third party cloud application and share the link to the storage

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As @patrick.ericson say
And
I believe
to get surface CAD , you need code python