The Pressure Controller (either Auto or Manual mode) is set to Field Elevation and local Altimeter (QNH) setting at beginning of descend. When the airport elevation is higher than cabin altitude in cruise (about 5000 feet @ FL350), then going into La Paz would require the cabin altitude to be "raised" during the descend. Passenger oxygen mask auto deployment circuit breaker will have to be pulled to preclude mask deployment; known in some jets as "oxygen avoidance" system, a switch rather than a circuit breaker.
