Repayment of EMployee benefit

Hi

We had an employee go on maternity leave, for just under  a year.  We continued to pay her medical insurance.  There were no weekly entiries made, as it normally came off her check .  Now that she is back, i need to figure out how to enter her payments to pay back  the company. I plan to make deductions from her weekly check to have the amount broken down into 52 payments so it is not a large amount at once.  I have figured out how to deduct the weekly amount from her check. Is there a way to somehow add the amount that she is owing so that the payments she makes comes off this total to keep track of the amount apid off??