Not sure about other fleets but;
744 FMC Progress page 3, RTA (Req Time of Arrival). Just punch in the waypoint and time Zulu followed by nothing (exact time), 'A' (At or after) or 'B' (By or before) and there ya go! The page will generate the required Mach or IAS and you either let VNAV fly the speed you just executed or manually control the autothrottle.