Cinema 4D Program Documentation Reference Cinema 4D Basic Features Spline Menu
Function available in CINEMA 4D Prime, Visualize, Broadcast, Studio & BodyPaint 3D

Reverse Sequence

To reverse the point order of a segment (i.e. make the first point the last point, the last point the first point and re-order all intervening points), select one or more points of the segment and choose Reverse Sequence. You can also apply this option simultaneously to several segments by Shift+selecting the points of these segments. If no points are selected, the sequence of the complete spline (and all of its segments) is reversed.