From the navigation, select Programs > choose your program and season > Structure. Once in the Structure, click the dollar sign icon on the top season-level group, a specific age group, or a team.
On the 'Add Debits' pop-up, you can sort and/or filter to find the players that have a remaining balance due:
You can also view any players for whom a debit was already created, so you can exclude them from the next batch if desired: