hmmm ...
Jaap,
It looked quite logical and simple when I read your response. However, when trying it, I continue to have ALL of the vertical chord notes copied onto the empty staff, not just the top voice.

I can see the correct 'filtered' notes ( on top ) I need to copy, but I cannot get just that single series of notes ( the top ones ) to copy. The whole chord structure gets copied ??? ... even though the filter has just the top notes of each chord outlined in dark blue ...

-- richard