Not a stupid question because I’m asking it also. I think I’ve found a way to do this.
Create a new MIDI track.
Highlight first track and use the Alt key to drag a copy onto the new track.
Highlight second track and use the Alt key to draw a copy onto the same new track.
You should now have two Lanes in the new track, which can be seen by clicking the “Show Lanes” icon for the track.
Now on the MIDI menu choose “Bounce MIDI”.
This will join the two lanes together.
I use this to put the melody - scattered over multiple tracks - into one track for an easy to follow score.
Regards, Richard.