With Golf League Tracker, each round has to be scheduled for a single course and side. To configure Golf League Tracker for split tee times (where players are sent off both the front and back at the same time), you can do the following:
Starting in 2019, Golf League Tracker supports automatic scheduling of split tee times. When you create your schedule, you'll see two rounds for each league date. You will need to set one to the front and one to the back 9. Note that split tee time scheduling cannot always be evenly divided between the front and back and it's not an exact science, but it should be really close. You may have to manually tweak your schedule after it is generated. It depends on how many Players and rounds you have scheduled. Also realize that some players will play one side or the another a few times in a row in order to even things out.
By default, each round will be displayed separately in the league standings screen when using split tee times, and the players who were not scheduled for a given side will be shown as "absent". However, you can turn on an option in Golf League Tracker called "Combine Same Date in Standings". When this option is ON, Golf League Tracker will attempt to combine the front and back 9 into a single "Round", and display them all at once.
Because Golf League Tracker handles split tee times as separate rounds, there would be a separate skins pot calculated for each side. So if 10 players play the front at $2 per player, the front side pot is $20, and if 8 players play the back at $2 per player, the back side pot is $16. These pots are not combined when viewing the winners and the amount won.