I think it depends on the type of operation. PNF normally sets up the whole route including SID, Route, STAR (if any) and the expected approach. The mileage from the box is then compared with the PLOG. When the clearance is received both pilots confirm that it is corresponds to what is entered in the FMS. If the expected arrival/approach changes from the anticipated one then the FMS is reprogrammed by the PF as part of the approach briefing. PF remains in control of the aircraft throughout. PNF does all the FMS work whilst below FL100 or when AP is disengaged in flight.