OK for setting as an axis you would just do a RefAll like normal when you start Mach and all your axis would be homed (turret included)
So say you have the home as tool 1 position then if you call tool 3 you know you have to rotate the axis by so many steps to get there, if its set in degrees then its really easy. You would just command a move in your macro similar to
If GetSelectedTool=3 Then
Code(" G0A120")
While Ismoving
Sleep(10)
Wend
Code ("G0A119)
End If
You would also need code to make sure it only rotates one way for positioning, something like
If GetSelectedTool<GetCurrentTool Then
Code("G0A360")........... etc
Hood
Edit
Just tested it here and seems rotational axis is only moving one direction, will have to look further to see if there is a setting for that but its nearly 2am now so I need sleep.
Edit again
If your want to move back one degree from for example A220 you would do a G0A-119
Hood