Converting parts into tracks

Hey, guys and gals.  I don't even know if I am wording the question properly.  Here is the case:
there is a MIDI file that I got.  Even when saved as a MIDI 1 file type, once opened, it shows only two MIDI tracks and each track is played by one distinct instrument.  Let's say, Track 1 is play by trombones and track two, by violins.
 
In the staff view, however, each track is divided in four staves, which I like it because it looks more realistic rather than having 16 notes at the same time, spreading from the third to the 7 octave.
 
Same for the second MIDI track.
 
Here is the question:  How can I save the file in such a way that every existing MIDI track is subdivided into 4 different staves (as in the staff view) in order to re-assign the instruments per staff, to fit the music style.  For example, rather than having 16 files assigned to the trombones in the first track, I would like the upper 4 notes played by trumpets, the 5-8 notes, clarinets, 9-13 by trombones and the rest by Tubas.
 
I know there is a brain out there with the answer.
 
Thanks every one in advance.

You need to move the notes you want in a separate track to a separate track if you want that behavior. If you just need to select notes in a range, you could use the event filter to select them, then cut and paste the selected notes to new tracks, and assign the instrument you want to play that track.