Make AutoPay filter by season

There needs to be a way of filtering autopay by season. Some of my students pay 10% of 10 month programwhile their siblings pay 25% of a 4 month program. They get lumped together which means that anyone with siblings I have to go in and manually enter their payments. So many get missed because of this. Please please please fix this! Surely I'm not the only studio with a difference in tuition percentages. Or if it can't be done can someone please give me an easier way to do autopay each month.