The 73 won't do that? The 75/76 does. Just dial down the bottom altitude, and it will descend in VNAV path no problem. You do have to use the speedbrakes or adjust thrust sometimes though.If you like longer stage lengths then the 73 has better trips overall than the 320. When given a "descend via" clearance, I can also set a lower altitude in the window, and the airplane will actually descend at the TOD point without further input.