You entered the notes you want, but WHERE did you enter them? It should be on the Melody or Soloist track. Otherwise, when the program regenerates the song, they get wiped over. You would have needed to Freeze the track. See jazzmammal's post, above.

If you have BIAB 2021, there is another easy way: copy the melody or soloist track to a utility track.



BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors