chords in full score

[plutek]

greetings!

i am copying an orchestral score in which there are three flute parts, 
always in rhythmic unison. we would like them to appear in the full 
score as chords, but still be easily extracted for parts. is there a way 
(other than a lot of cut'n'paste) to do this?

my basic strategy for the piece is separate files for each instrument, 
combined with includes in the score. i'm using lilypond v2.7.32.

thanks!

-p