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Are you asking how to move the starting point of a selected sketch? If so the answer is to click on the circle at the base of the yellow/orange arrow and move it to a different vertex. If you are asking how to add a point to a sketch then you simply break up the sketch into additional lines. If you are asking something else then it would be good to add a little more detail.
This is a swept blend using Selected Sections. Is there a way to continue the curve to the point where the trajectoris converge?
Many thanks for your assistance.
I should have asked is there a way to continue the surface to the point were the trajectories converge.
If you are not able to select the point where curve converges, try creating a new reference point (on the converge section) on the fly, see if that works.
You can refer to hlp center document About Swept Blends, may be you could find something which works for you.