After you have created the Sections for your Montage in the Montage area, you can define the Sections' relationships to each other in the Sections area.
By default, all Sections are set to play sequentially, indicated by the single Section track containing each of the Sections.
Pressing the Clear button will assign a single track for each Section you have created.
Pressing Create Default will return all Sections to the single Section track.
In our example, we have a Start, a Loop, and an End. We want the Montage to play the Start section immediately, followed by the Loop section.
Once we get to the Loop section, we want to keep looping that Section until the End Section is told to play through Blueprint or C++.
To do this, we first click the Start Section in the Section Track.
We can now define what Section should follow the Start Section, so we click the Loop button at the top of the Section area.
When we do this, Loop is added and follows Start on the first track. When we click Loop on the track, then click the Loop button at the top, Loop will turn blue.
Since we associated Loop with itself, the system knows that we want this Section to loop.
We can preview this by clicking the Preview button on the track we want to preview and the Play button from the toolbar at the bottom.