How to enter TD1 in payroll

We're stuck on how to enter a new TD1.  We have the basic amount ($12069) and the employee filled out $10150 for Tuition amount.  If we put the amount $10150 as TD1 - Tuition and Edu in Sage 300, is the amount on "TD1-Total Tax Credit" in Sage (12069+10150=$22,219)?  We aren't sure if we are to add them together, or if the total tax credit should equal the basic amount.

We're new at this since our payroll person has retired!

Thanks!