In this (constructed) example slide positions for the 3rd trombone are to appear in the voice but not in the score. Therefore the digits obtain the property „object is visible in case of voice extraction” in the Edit area.
The other way round: Conductor’s comments are to be visible only in the entire score but not in the voice extractions. When you select this property a message „Create a copy…?“ will appear. Please select „Cancel“ – we will deal with this in next month’s newsletter.