Code:
cat > tmp
XTurb7670,B,AA,Filo060E-02052
XTurb7670,A/B,AA,Filo067E-02068
XTurb7670,A/B,AA,Filo067E-02070
XTurb7670,A/B,AA,Filo067E-02071
XTurb7670,A/B,AA,Filo067E-02073
XTurb7670,A/B,AA,Filo067E-02075
XTurb7670,A/B,AA,Filo067E-02076
XTurb7670,A/B,AA,Filo067E-02083
XTurb7670,A/B,AA,Filo067E-02084
XTurb7670,A/B,AA,Filo067E-02086
XTurb7670,A,GG,Filo067E-02065
$ sort -t, -k1,1 -k2.3,2.3 -k2.1,2.1 tmp
XTurb7670,B,AA,Filo060E-02052
XTurb7670,A/B,AA,Filo067E-02068
XTurb7670,A/B,AA,Filo067E-02070
XTurb7670,A/B,AA,Filo067E-02071
XTurb7670,A/B,AA,Filo067E-02073
XTurb7670,A/B,AA,Filo067E-02075
XTurb7670,A/B,AA,Filo067E-02076
XTurb7670,A/B,AA,Filo067E-02083
XTurb7670,A/B,AA,Filo067E-02084
XTurb7670,A/B,AA,Filo067E-02086
XTurb7670,A,GG,Filo067E-02065