Hello,
Thanks for your relpy but what i obtained is a staff over or below the one I have son not exactly what I want : I want to have for example one musician who plays piano and suddenly must play a glockenspiel (or other things with only one stave) for a moment like in my example so no need two staves .
My first topics so you can better understand what I want was when Dorico was in version 1.1:
I also want to use this to make some educational material with sometimes only one part of piano and sometimes with two parts
Best regards