Yikes. Agree with macropod. This is not something Word will do well. It may be possible but I suspect it would take a bit of fussing by someone who IS a bit of a whizz kid. I think it can be done, and someone may be interested in taking it on a project but I can not at this time.

You may want to look into finding a copy of PrintMusic which has functions like what you describe. It is a dedicated music score application; Word is not. As macropod mentions, it is a word processor.