Need help on the following:
I have a curve polyline which I wish to lock in two places and then pull it a little bit in its center in order to augment its curvature.
Is this possible?
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Polylines can contain arc segments but they cannot be edited in the way you describe. I suggest you try working with a spline. If you create a spline using 3 points, you can position the end points as required and then use the middle one to modify the curve (grip edit).