Golfsoftware.com's League Manager can handle any number of split seasons. It's easy to divide your season by customizing your season reports.
In Post-Play, click on Results.
In the next window that appears, click on Results again to select a result to view (1b, 2b, 2d).
Now to customize the season reports to show only the events you want for each half. (Or third of a season, etc.)
Example: Your league has a split season where events 1 to 10 are the first half and 11 to 20 the second half.
For the first half of our season, click on any season report (1b, 2b, 2d) & set the event range to 1 to 10. Now only scores and points for events 1 to 10 will be used to calculate results.
View your results and publish to website; using the Description: 'First Half of Season' and clicking the 'Add - automatic update' button.
For the second half, click on any season report (1b, 2b, 2d) & set the event range to 11 to 20. Now only scores and points for events 11 to 20 will be used to calculate results.
View your results and publish to website; using the Description: 'Second Half of Season' and clicking the 'Add - automatic update' button.
Note: You can keep the original published report (with event range 1 to 20) to show the results for the season total (both splits added together).
Or you can remove it from your website by using on the 'Edit results on website...' button on the Post-Play Results page.