In Sibelius the Re-Input Pitch feature is a life-saver for creating mirrored instrument section passages, respelling notes instead of re-entering them all.
WTH is this feature in Dorico Pro 3.5??? 
It’s the padlock in the left panel, or type L.
Or, as Alan Silvestri said: Alan Silvestri, Scoring a Blockbuster, Part 2: Working in Dorico | Artist - YouTube
Bless you!