I too am frustrated that bills can not be split in Quickbooks. 

My daughter's co-parent and I both pay for my daughters daycare tuition through quickbooks. The school can't split the bill between us! He wants to use autopay, but this locks me out from making a payment. I do not want to reimburse him each month. 

The way quickbooks is set up, it feels like the year 2000. I mean, we all pay everything online, why can't the school split the bill too. QB feels pretty outdated this way. 

Frustrated parent in Idaho!