No, it doesn't. You need to make sure that in target sector they are in proper order. Basicly in target sector the plane continues, i.e. in your imagination extend that floor or ceiling of the source sector so that it reaches target sector and you will get a oicture on how the slope will go there. So the best way is to place source sectors kinda paralelly so that slopes are going the same way, i.e. kinda mirror. Yes, it's a bit complicated, but once you'll understand how it works, it won't be too hard anymore.