Split Tickets with different dates

[Jodi]

Does anyone know how or have a trick for recording transactions that are 50% down and 50% at completion?

I have one customer that wants to do this but I cannot figure out a way to record this and still be able to give a receipt for the 1 order with the two dates recorded and the back office still correct for sales tax. Turn around is 8 weeks so both payments will not be in the same month.