I am using PSS 777 and 747-400 panel. I often do flights with the two panels. Somtimes I do long haul flight, which the plane carries much fuel, and the plane will climb initially at a lower level to reduce the weight of it first. And then, I will climb to a higher level. Yet, I don't know how to use FMC to make the plane climb automatically to a higher level. I have inserted the assigned speed and altitude into the RTE page. And then I let the plane fly by LNAV and VNAV. After passing the waypoint which the plane is supposed to climb, the plane reacts nothing. I wonder what I've missed. Can anyone explain what I do wrong and correct me? Thanks for answering.