It depends what you call easy and how much precision you need in positioning and also how much resistance is place on them once they are in position.
This is known as point-to-point positioning, so it usually does not need any kind of exotic servo positioning.
The mechanics for instance could be done by pneumatic cyclinders and clamps, and the controller could be anything from relay logic and limit switch positioning, but the easiest way to control would be by a small PLC.
If you want to motorize them, you could also use steppers with a simple stepper controller that puts out a string of pulses for each position that is switch selectable.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.