Complete this form to request modification, termination, or reinstatement of an existing support order. Yes, you can write your child support modification letter using our templates or form builder, which will guide you through the creation process.Download a free child support modification form to propose changes to a current child support agreement. Available in PDF or Word format. To file such a motion, you generally need to explain the change in circumstances that have taken place which warrant changing the current support order. This document is a sample form letter designed for individuals seeking a downward modification of their child support obligations. Box 1: Print the county in which you are filing your petition. See "Where do I. File?" in the Introduction for more information about what county you. This is the form which will be presented to the court for consideration of your modification request. Each of the documents listed below inculde a blank form and the instructions to fill out that form.