How can I loop a section of a song in Garageband?

In Logic this is known as a region -- a portion of a song like a verse, or a chorus or a bridge. Usually it is done by highlighting a portion of the timeline. I know how to loop a region (a snippet of music played by an instrument.) I want a portion of the song to keep looping around in its entirety.

Must be a simple way to do this! ;^D