Selecting the Manage Splits option will bring you to this screen. Click on Add New Split.

The system will add two splits to the event. The first will be a one year split starting with the minimum age for the event and the second will be all ages above that. From that point on, age ranges may be modified and more splits can be added.

If the tournament is set up to use a lottery, there will be an extra column allowing the TD to set a maximum number of lottery registrations for each age split.