Hello Folks!

I have 12 tracks in MWS and on track 2 there is a 12 bar chord progression that sounds great.
Now I want to save that section, the 12 bar MIDI chord on track 2, so I can use it in another song or make a kind of MIDI library of interesting chords.
I selected track 2 and those 12 bar, I even clicked on the track number and then from the menu "export MIDI file".
Closed that song and opened a new blank session, imported the 12 bar MIDI file but then all 12 tracks loaded as well.
So how do you select and save only certain parts of a MIDI section?