Here's what to expect when you request for a modification of your child support order. Click here to learn the steps in the modification journey.You're always welcome to change the way you make your child support payments, but the court-ordered amount can change only through a court order. Step 1: Fill out your court forms. Fill out the following starting forms: â—‹ Petition to Modify the Parent-Child Relationship. If you would like to change a child support or custody order that resulted from a SAPCR, you will need to file with the court for a modification. Cause Number: (Fill in the cause number and court information exactly as it is written on the order you want to change.). File this form when you and the other party cannot agree to a temporary arrangement for parenting, child support, or other issues before the final hearing date. Asking for a modification review: You will first need to ask for a modification review. How to fill out child support modification papers?