Almost right - with a designated VNAV approach in the data base, within 25 miles of TD, past the 'on approach' waypoint and with the minima set in the Alt Sel window, you will remain in VNAV PATH with the speed window open as you command the deceleration. There are probably a couple of other requirements but that's the nuts of it. Reset the Alt Sel window to the missed approach value when more than 300' below said value (ie below 2700' if go around alt is 3000') and off you go! Works well if a little stressful when approaching/passing said 'on approach' waypoint waiting for VNAV SPEED to change to VNAV PATH.
