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
In GarageBand on Mac, do one of the following:
Command-click a software instrument track at the point in time where you want the region to start.
Control-click a software instrument track, then choose Create MIDI Region from the shortcut menu.
In GarageBand on Mac, do one of the following:
Command-click an audio track at the point in time where you want the region to start.
Control-click an audio track, then choose Add Audio File from the shortcut menu.
Choose the audio file for the region from the Open dialog.
In GarageBand on Mac, command-click a Drummer track at the point in time where you want the region to start.
Control-click a Drummer track, then choose Create Drummer Region from the shortcut menu.