This document is a sample form letter designed for individuals seeking a downward modification of their child support obligations. To change or modify a court order, a party must file a petition with the court requesting the change.Change happens, that includes your child support order. We can review the amount you are paying and can make adjustments based on your current income. Download a free child support modification form to propose changes to a current child support agreement. Available in PDF or Word format. The Virginia Judicial System has a number of forms for each court available on the court's form page. What would I need for the court? The first is for the primary physical custodian to file for child support in the local court. Fill out a child support modification petition. 2.