Display MoreBlock A is at 1 block height.
Block B is at a 3 block height.
Block A & B are 30 blocks apart.
Grade that area smooth from block A to block B, and have the option to place objects in that defined area to that grade.
you can do that by using the smoothing tool in creative mode F5 -> 2 or using a rake but then it is quite hard to get it right. Maybe won't be as smooth as you may want it but it can be done to a reasonable extent