The default Tuition Split on TM is 50/50 (after the deposit is paid). We do a 60/40 split of remaining tuition due, so we have to manually update any families that have selected the two-payment option with their new amounts due.
This can also be applied to split families. We have a lot of families that don't do an exact 50/50 split, so it would be nice to be able to edit the contract to reflect custom percentages.