Child Support Forms ; 4-3b. Addendum to Support Petition– Request for Child Support (IV-D) Services.These forms allow parents, families, and employers to provide the Child Support Division with additional information so we can better serve you. This can often be accomplished online. Write the letter spelling out the time line and chronicle the events of your child being taken out of state without your knowledge and permission. This guide includes forms and instructions for a letter and affidavit to request that the court register an out-of-state custody order in Texas. What do I need to do to stop child support withholding? Step 1: Fill out the forms. A custodial parent can waive or forgive all arrears owed to him or her directly. It is not so hard if you go fill out paperwork from the court.