I am not totally sure what you are after in your post. I am assuming that you would like the program to apply the Segment command across your 4 sketch segments rather than to an individual sketch segment. If that is the case you would want to first create a Fit Spline (GoEngineer - Fit Spline) of the sketch segments you have. This will merge them all into a single entity so that when you use the Segment command it spreads across the entire length of your contour rather than a single segment of your contour.
How about using points?,,, here on a FitSpline of your sketch, you would have to use the points to make your segments though
Pretty Similar with Face Curves
I thought it could have been possible using sheet metal but the segments got lost on the refold