Divided voices

[northofscotland]

I have a question about the best way to produce music when it divides for
maybe only a few bars in a piece.  I often come across this when setting
SATB vocal works.  Straight forward SATB with a single voice to a line is
simple enough, but I am struggling to find an elegant (and simple!) way to
deal with a part that may divide into, say, S1 and S2 perhaps only for a few
notes in the whole piece.  The way I have sorted it so far is to duplicate
the S line, put in the changed notes and substitute the common notes with
skips, then combine them with something like
\new Voice = "sopcombo"  {\voiceOne << \global \sopMusic \sopDiv >> }

Whilst this seems to work reasonably well I do seem to lose some
articulations, slurs etc in the process, and it does seem rather cumbersome.

Division such as this is common enough in such music and I would have
thought it could have a simple solution.  Published music and the products
of eg Sibelius seem to readily produce such results.  Any ideas?  Thanks
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