Can a glissando be entered on a score? I can't seem to find anything on this symbol.
If it can, can it transcend from the treble to the bass staffs on a piano composition?
NWC does not currently support this. NWC does not support transcending items from one staff to another, even is it is a grand staff (which is treated as two separate parts, usually a bass and a treble part, in NWC).