This kind of notation (and not only tis one) often calls for the option to change the direction of the stem within a group of beamed notes, but I can't see how this can be done.
Any help?
Baroque music does this on a single staff. Here is the basic (ver 2.5+) workaround:
!NoteWorthyComposer(2.5)
|AddStaff|Name:"Staff"
|StaffProperties|EndingBar:Open (hidden)|WithNextStaff:Layer
|Note|Dur:8th|Pos:0z|Opts:Stem=Down,StemLength=1,Beam=First,XNoteSpace=1,NoLegerLines,Muted
|Spacer|Width:0|Color:1
|Note|Dur:8th|Pos:3|Opts:Stem=Down,StemLength=6,Beam=End
|AddStaff|Name:"Staff-1"
|StaffProperties|EndingBar:Open (hidden)
|RestChord|Dur:8th|Opts:Stem=Down,StemLength=6,HideRest|Dur2:4th|Pos2:-6
|Rest|Dur:8th|Opts:Stem=Down|Visibility:Never
!NoteWorthyComposer-End
IMO, NWC should support this directly on a single staff.
Cross staff beaming is unlikely to be directly supported due the the added complexity of how staves interact in NWC.
The attachment from Clair de Lune shows some cross staff beaming that can be acheived in NWC 2.5+
I would like more tools to simplify this but I don't think it will ever become easy. Much of the difficulty in the attachment is the slurs ...