There are two ways to do this in DComply. If you use DComply pay, the parent that is owed a balance would submit a bill for the balance in the system and both parents would mark the outstanding bills “paid offline.” This way all that is left is the balance. The second way is without DComply Pay. At any point the parent that owes money can send payment for the balance and then both parties can simply clean out the bills by marking each as paid.
Our experience is that monthly or quarterly settlements work best with  co-parents that firmly agree on the settlement process.