Before playing out an element, you can load it to the timeline to build up a small sequences before the playout starts. For example you could load several videos to the timeline, in which case they appear as a sequence one after the other.
Click on the load button of the selected element to load it to the timeline right after the last element in the timeline.
Once loaded, you can still:
change the In/Out-point of movies using the Preview window
change the attributes of movies in the Inspector
change the attributes of RT graphics elements in the Inspector
change the attributes of audio files in the Inspector
change the attributes of Events in the Inspector
remove an element from the timeline
add elements to the timeline
Be careful when building a rundown i the timeline, because the running order can not be changed once loaded.