\version "2.16.1"
Vlne = \relative c'' {                                                                  
  \once \override PhrasingSlur #'extra-offset = #'(0 . -.3) a8\p ( \( g) bes (a) \) \once \override Slur #'extra-offset = #'(0 . -.3) a2~\(a8 (g) bes (a) \) 
  \once \override Slur #'extra-offset = #'(0 . -.3) a2~ }         
\addQuote "Vlne" { \Vlne}  

Vla = \relative c'' {
  a,8\p ( \( g) bes (a) \) }
\addQuote "Vla" { \Vla} 

\relative c' {
  \time 4/4
\new CueVoice \with {
    instrumentCueName = \markup \italic "V." }
  \cueDuring #"Vlne" #UP {R1*2} 
\normalsize f'4\p e (f) d 
\time 3/2 \set Score.skipBars = ##t R1.*2
\time 4/4 R1*3
\new CueVoice \with {
    instrumentCueName = \markup \italic "VA." }
  \cueDuring #"Vla" #UP {r2}
r4 f--\p e2. r4
}