Form must be filled out and notarized at the time of filing. Child Support Forms ; 4-3a.Petition (Commissioner). You can go to court to file the petition or go online to New York State DIY (Do-. It-Yourself) Forms at nycourthelp. Please note that DTF first files a warrant in a county clerk's office, and then files a notice of such filing in this office. Get a lawyer to start a lawsuit against your former significant other for the establishment and failure to pay child support. Under this section, all orders and judgments for child support in the specified proceedings operate as statutory liens. Letter 3527, Notice of Federal Tax Lien Filing-Child Support Obligation.