project curve cut
Arif,,, I don't quite understand what you are trying to do. If you do a straight cut extrude with "Normal Cut" you would end up with the same result as you would by projecting your sketch doing an unfold then cut with your projected curve then a fold. Do you want something like a wrap with your sketch? you can do that with 2017 I believe. I will have to try that.
I tried to highlight the curve.. You can see that a straight cut ends up in the same place.
Edit:.. Yes you can use the wrap feature in 2017 to wrap the sketch and make the cut.
Another Edit:.. Or you may want to use a split line instead of curve (then surface-offset, then cut-thicken). You do get a slightly different result but I'm not sure what the function of the cut is so I can't tell you definitively what to use.
Use "Unfold" on the single edge, apply the cut, then use the "Fold" command.
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