The Opta Rugby import requires the user to subscribe to their data services. Choose File > Import > Opta Rugby… then select the XML file provided by Opta. The import will ask whether you wish to have two timelines or one single timeline. The two timelines option will create a timeline for the two halves of the match, the single timeline option will create one timeline for the entire match including half time.
If you are stacking timelines and capturing footage only during match play, then choosing two timelines is a great way of stacking and then combining the game for optimal file sizes.