doubtfire...the rapid descent is laid out in a nice little diagram which I won't reproduce here, but in sequence the important part of the text is:
"Initiate turn if required using HDG/TRK SEL"
"Select lower altitude on MCP" "
select "FLCH" .......
Some operators teach changing the MCP altitude before the heading for "flow" purposes across the panel but in any event Boeing simply specify rotating two knobs without nominating the direction in the hdg case and without specifying the initial increment in either case, and then a third button to push to get the beast descending, you then refine heading, altitude ( and speed) once you are in the descent.
There's obviously a chance on a 777 you might choose to go for 90 left but it's not Boeing SOP, not in the manuals and as such a 90 left is not an automatic or conditioned response/setting if you train in accordance with Boeing procedures.
(Apologies to claybird who beat me to it)