Declining balance benefit

Hello,

Is there a way to set up a benefit with a declining balance?

Here's an example of what I need:

An employee is terminated with salary continuance, they have qualified to receive 100,000.00 over the next 12 months, and let's say they are paid monthly.  They are setup to receive 8,400 each month, which would be 100,800 if multiplied x 12 so the last pay is only the remaining 7,600.

What I'm expecting is that I would enter a flat dollar benefit DBA in Employee DBA instructions with the 8,400 in the amount field and 100,000 in the amount due field and payroll would automatically process the 8,400 each pay period until the 100,000 is reached and it would only pay out the remaining balance in the last pay period.