how to rotate a spline sketch that i imported into the solidworks?

i got the coordinate data of two spline and imported the coordinate to the solidworks using 'curve through xyz points' . i combined the two curves together using "composite curve "and the convert them into entity. I got a twist angle and wanna the graph rotate based on the red point(seen attachment please). but the "rotate entities " doesn't work, please help me, thanks in advance.

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You can't rotate a sketch around a point that's positioned in the perimeter of the sketch. The rotation axle have to be outside.
By the way, the point is already on the axle. You don't need the downer curve, close the upper curve with a line and rotate it using the line as rotation axle.

 
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