First look in resources if you haven't downloaded SourceSplit

Right click LiveSplit -> Edit Layout -> Click the plus sign -> Hover "Other" then click SourceSplit -> Double click on SourceSplit -> Enable "Also Auto-Start when..." -> Type in ge01

You'll have to manually split the last split right before the next map that has a cutscene for some reason. You'll know because the timer will freeze, when it does that, just split manually.