Hello!
Only Option-Up/Down Arrow works; and that’s one step at a time. I tried all sorts of other combinations of Shift; all three; all four; nothing. 
Any ideas?
Are you in Write mode?
Did you check key commands (Edit–Preferences–Key Commands) to see if you mapped something else to that binding, and to make sure it is mapped to transpose?
Is it possible another program is using that combination?
Thanx, for your trouble-shooting efforts!
These two screen-shots will tell you what I’ve gotten.
In “Preferences - Key commands - Edit” - I assigned “Cmd-Opt-Up” to “transpose” (the window doesn’t specify whether “up” or “down”). Then in “Write Mode”, when i engage the command, the second “very confusing” window opens. I’m lost at that point. 
No screenshots showed up…
But “Transpose” is not the command you want, I think! You want “Raise/Lower Pitch by octave.”
I obviously misunderstood your earlier post …
Did you check key commands (Edit–Preferences–Key Commands) to see if you mapped something else to that binding, and to make sure it is mapped to transpose?
Lemme see, again.
Sorry about the screen-shots.
Yes, I misunderstood what you meant by “transpose.” Ctrl-Shift-up/down raises or lowers the pitch by an octave. That’s what you want, right? It is indeed transposing, but “Transpose” in Dorico opens the window you ended up with, which is different than just moving pitches around. “Transpose” in Dorico is for changing the key and everything, not merely raising or lower pitches.
Map Ctrl-Shift-Up to “Raise Pitch by Octave” and Ctrl-Shift-Down to “Lower Pitch by Octave,” if those are the commands you want (I think they are).
FINALLY!!
Yes; that’s the process, indeed. It’s under, “Note editing”, not “Edit”.
Al is well with the world now!
Thanx, again!