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As soon as you start to play music having only a melody line (and possibly chord symbols with it) you'll encounter the need for an arrangement.
If you have your melody line available in MusiCAD arranging becomes a much easier job using a few built in facilities.
An extra part
Let's go for an example: Hava nagila as supplied with the example tunes.
To be honest, this isn't the most obvious tune, since it uses a not too often used scale, frygian mode featuring a consequent but unusual sharpening of g - the third note - into a g#.
Now let's use MusiCAD arrangement facilities to add a part a sixth below: Select 
to add a new part to our tune.
And hit OK
Ouch, sounds awful...
We need to rise all the g's to g# and lower all b#'s to b.
While doing that in the editor there is one more anomaly to counteract: MusiCAD will not automatically suppress or add accidentals with notes that are tied over a bar-line; as soon as the second g is changed to a g#, everything looks fine for the first note of the second bar. However, MusiCAD still sees a g and no g#, so we'll need a bit more trickery: sharpen the g with <+> and suppress the (usually redundant) sharp with <W>. Since there is one more g to be sharpened (the last note of the second bar) that one needs some special attention too: MusiCAD does'n assign an accidental because id did already so. We in turn, suppressed the sharp at the first note, but now we have to make the sharp explicit again for the last note in second bar.
Although we had to tackle a few pecularities in this particular tune, the procedure is quite straighforward.
see also: how to transpose music
