Please note that NWC2 is still in public beta. Usage of NWC2 is subject to eligibility requirements by Noteworthy Software. Details are at their website.

Parts

remove | retain

are required keywords. Either remove the part, or retain that part.

top | bottom | pos=<pos>

are required keywords, indicating which part to remove or retain.
pos=<pos> will instead of removing/retaining a top or bottom part, will remove or retain a part whose position on the stave matches <pos>.
<pos> is made up of an optional ##,#,b, or bb (indicating double or single sharps and flats), directly adjacent to a signed integer, indicating how far from the centre line on the staff that the note is.
If you are using this option, it is strongly suggested that you use Tools | Force Accidentals beforehand to ensure that you will get all the notes that you intend.

nosingle

is an optional keyword. If this parameter is present, if a single note is encountered, it will be replaced by a rest.

Invocation Instructions   This is a pdf document