I'm fairly sure you could do this with version 2008:

Opt., Preferences, Notation, set Transpose to +5

Why? See below.

Type in your chords C7 C7 | G6 G6 etc. as written for the alto part in G

Opt., Preferences, Notation, set Transpose to -9

Read the correct chords for alto sax. Should be E7 E7 | B6 B6

Opt., Preferences, Notation, set Transpose to 0

Save the song. It is now in concert pitch for the next time you need it.
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Where did I get the number, +5?

An alto flute in G sounds 5 half-steps below concert pitch, so to compensate, write it 5 half-steps higher.

Do a similar change for alto sax, which sounds 9 half-steps lower than concert pitch, so compensate by writing it 9 half-steps higher.

The Transpose pull-down has a setting for alto sax and many common instruments, but not for alto flute or other G instrument, so you have to enter that number +5 rather than use the pull-down.

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Here's an even easier way to do it:

Set the key signature of the song to Bb.

Enter your song for the alto instrument in G.

Change the key signature pull-down to D. Say YES to "OK to Transpose Worksheet" prompt.

Why "D"?

To go from a G instrument to an Eb instrument, you go down 4 half-steps. To compensate, take the key of Bb, and go up 4 half-steps to D.


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