Yes. I have a grand staff below (the piano part) and on occasion, one to three single treble lines above for singing parts. The problem is, the way my piano part includes the main singing part on the piano grand staff (my RH mainly plays the melody/singing part) so the extra parts above are only once in a while. However, the first time I write in an obligato or want to do a two-part song (one included in the piano part and one alone above that part), that staff continues through the end of the composition, even when notes are not present. I can see the staff in gray and it prints with music, empty. Thus, my composition is VERY long with a whole bunch of empty staves above the grand staff.