Sequencing is a powerful feature that lets you manually set a sequence of titles to play in a set order. First, set up a new playlist and populate it with titles.
Make sure all of your titles have set durations. That means the No Limit checkbox is unchecked in the Attributes panel.
You can now select which title will play after each of your titles have finished.
If you select a title to play itself next, it will initiate a loop sequence and the title will play indefinitely until you play it out.
You can also set a title's duration by double-clicking on the duration field.