How to tie a note in a chord to a note outside a chord

[Jayaratna]

Dear subscribers,

I am inputting some very complicated polyphonic music for keyboard. Maybe
this is a newbie idiotic question, but I cannot understand how to input
these two bars: the problem is printing the tied A across the measures while
keeping the second one in the same chord with the upper C. This does not
seem to work:

  <<{\stemUp c2^~ c4}\\{\stemDown g4 \stemUp a4_~ a}>>


nor this:


  <<{\stemUp c2~}\\{\stemDown g4 a_~}>> <c a>4



http://www.nabble.com/file/p21889121/esempioee8.png 

Thanks for your suggestions,
Andrea
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