Another quick way would be changing the des speed lim, usually 250/FL100 with your new speed.
In the example above, if you are descending at 270 passing FL180 and Atc tells “speed 230”, simply change the speed lim in 230/FL180. This way your profile is updated with your speed. At high levels it’s quite useful. Below fl100 I usually just go open des and use hockey sticks to fine tune my descent