Complete this form to request modification, termination, or reinstatement of an existing 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. 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. Sample Forms These sample forms may be useful when filing documents for the civil and family courts. If you have any questions, consult an attorney. Yes, you can write your child support modification letter using our templates or form builder, which will guide you through the creation process. 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. Each of the documents listed below inculde a blank form and the instructions to fill out that form.