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.Step 1: Fill out your court forms. Fill out the following starting forms: â—‹ Petition to Modify the Parent-Child Relationship. 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. You will need to put your SSN, Cause Number, Case Number, and your First and Last Name in the email. 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.). A parent who wishes to alter an order pertaining to child support must file a suit for modification in the county that issued the current order. To request a CSRP, a parent must complete and submit a request form to the Texas Attorney General's Office.