For SEVERE turbulence in the 744 Boeing sez:
After takeoff and when established in a clean climb configuration, the autoflight system is recommended for flight through turbulence. To reduce pitch changes as the AFDS attempts to fly speed with elevators, climb and descend using vertical speed (SPD on thrust) and cruise using altitude hold.
Otherwise use normal autothrottle and autopilot procedures.
Few of us encounter severe turbulence on a regular basis, so normal procedures should be the default.