Do the take off in this way. When passing 400ft AGL, selcet LNAV (or HDG sel. depends on situation), when passing 1000ft AGL (standard) select VNAV. Now the TO-Power will change to CLB-power. When the aircraft has a lower weight you can preselect TO-1 or TO2 (if the weight is very low) in the way I have wriiten above. Now the TO-Thrust will reduce to the preselected climb-modus (CLB1 or CLB2) when you selecting VNAV.

Everything clear?