Season due dates

We have 3 seasons, fall, winter and spring, that all open for registration on the same date as the fall season, primarily so parents can be sure they will be registered for the full year rather than waiting and later finding winter and spring classes are full. Each season has its own due date giving parents the option of paying for the full year or as each season is due. If parents register for all three seasons at once then they are combined by DSP and everything shows up due in the fall. This is very confusing on statements and we have to manually go into each account and separate the registration into each season. If parents register for each season separately then the correct due dates show for each one but that is time consuming for parents and hard to explain as well. It would save so much time and confusion if due dates were permanently attached to each season, no matter how registration took place.