Order (Relief from Support Payments and Commitment). PDF. 4-16. Notice of Motion To Quash, Fix or Modify Conditions of A Child Support Subpoena.1. Fill out a child support modification petition. 2. File the petition with the Family Court that most recently established your order. 3. Use this program to ask (or "petition") the Family Court to change a support order if there is a "change in circumstances." Us with the subject 'Modify Order' and request a phone appointment. Discover which reasons to modify child support are valid in New York. Work with one of our attorneys to modify your child support. Gov and accessing the "forms" link. All one has to do to ask for a modification of child support is go to the court and file a petition.