Most of spin generated can be contributed to equipment and conditions of the course.
Lets face it the pros are usually playing on courses that are in far better shape than our home courses, tight fairways and greens help alot when producing spin, but as for technique on those 30-70 yard shots you see a lot of pros set their clubface square to the target, then align their body left of the target (for a rightie) keeping your clubface square swing along the path of your body and instead of digging into the turf youll sweep across the turf passing the clubface through the ball with much more speed than you would if you chopped down into the ball, there for generating more spin. Depending on how hi or lowyou want to play the shot depends on where the ball is positioned in your stance and the angle of your wrists