no, I can see that making the simplest possible example wasn’t helpful - thanks though
this isn’t the actual music I’m dealing with. It’s a huge orchestral reduction job and there are hundreds of bars, with many different independent parts, some with large chords in multiple voices over multiple staves, I input them in separate staves using groups but now want to move them to multi-staff instruments.
Copying each line separately and pasting it into a piano-staff works fine