Making Chords M7
In an empty staff, add 2 chords symbols : C^. and CM7
Use the contextual menu "Making chords" (4 notes) :
C^ give C E G C
CM7 give C E G B
When playing theses chords, C^ sound like C and CM7 sound like CM7
Bm7b5, B0 (zero) and BO (letter "O") are working very well.