converting 3D model to 2D sketch

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I have certain 3D models if hollow cylindrical shape in sheet metal apllication & i want to convert them to 2D sketch. The sketch shpuld be equivalent to cylinder when it is seen from the front........... can you help

How would you do this manually -- what sequence of interactive NX functions would you use?

Once you describe the process, people can probably figure out how to automate it.

Do you need this to done using SNAP functions alone?