In addition to recording regions or dragging Apple Loops and other media files, you can create regions in the Tracks area. You can:
Create empty MIDI regions in a software instrument track
Create regions containing an audio file in an audio track
Create regions with the same Drummer settings in a Drummer track
Command-click in an audio or software instrument track at the point in time where you want the region to start.
For audio regions, choose the audio file for the region from the Open menu.