optimising typesetting 2 voices with same notes

[-Eluze]

hi

i want to typeset a little étude for guitar written by Fernando Sor.

here are the first measures:

Allegro con moto
http://old.nabble.com/file/p31676255/Sor%2BAllegro%2Bcon%2Bmoto.png 

obviously every odd 8th of the upper voice is identical to the 2nd voice -
except for the duration (this is true for about 80-90 percent of the piece).

my question is how to proceed to have a minimal effort and not to write the
same notes twice.
is there a function to automatically add the "quarters" to the second
voice?!

thanks for any idea.

Eluze

i am gratefull too if somebody could tell me the opus number of this piece!
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