Not sure what type you're on, but on the 767 when it comes to slowing down to clean speed you can use the speed restriction option on the descent page to slow it down at a particular altitude, or a hard speed on the legs page to slow it down at a particular point. Both options assume idle thrust and rely on the correct winds so you may find yourself needing to add power or speedbrake.
If you're really lazy and want to make VNAV do it all for you, build a geometric path: Pick a prior point and look at the predicted alt - if it says 14100 then type /13000. That will force a geometric path between that and the next point that is slightly shallower requiring more thrust than idle. The FMAs will change to SPD / PATH and the autothrottle will adjust the speed without the need for speedbrake. Just don't confuse it for approach logic!