What do you need the curve reversed for. You can reverse a curve during certain operations. A direction arrow will appear at the start of curve.
If you really need to reverse it you can use join curve - select the curve select the red direction arrow, select ok.
To avoid having duplicate geometry - turn on no keep mode
Inverting curves is especially helpful when you are creating templates, from which you will replace geometry and/or create macros from, and it needs to operate the same way with no intervention...
Well done gentlemen. Curve dirrection was a concern for me when Creating Power Copy of adaptive sweep. The Sketch was constrained tanget to intersect curve but result returned to wrong quadrant of tangency.. really weird and Frustrating.. At this time I'm not sure if curve dirrection really fixed my problem..
When I prepare my style data for Developement I'll make curve dirrection always the same ei: start vertex always closest to origin maybe. Then next hood dirrection for copy is correct.