You can record to multiple software instrument tracks simultaneously.
During recording, any adjustments to knobs or other controls in the Smart Controls area are recorded as region-based automation. You can use MIDI Draw to edit the Smart Controls Recording later.
Click the Record Enable button 
in the track header of each track you want to record to.
Move the playhead to the point in the ruler where you want to start recording.
Set the metronome and count-in to hear a steady beat while recording.
Click the Record button 
in the control bar (or press R) to start recording.
Use your MIDI keyboard, Musical Typing window, or onscreen music keyboard to play some notes. Record as many cycle passes as you wish.
A new MIDI region appears on each of the record-enabled tracks.
Click the Stop button 
in the control bar (or press the Space bar) to stop recording.