Splits Manager
The Edit Splits panel is accessible, either through the Edit Data Panel, or through the main menu. “Tools”, “Manage Splits”

Screen Shot 2012-09-22 at 7.45.05 PM

Auto will automatically generate classic splits (1 for 2, 2 for 3, etc...) for the selected stock. If the split is a bit exotic, it can be added manually using the Add button.