Step 1: Fill out the forms: If you have an existing case, no matter how old, use the same case title and case number. To fill out this form, first gather all necessary information regarding your case and the parties involved.Most motions are filed as a Request for Order or Notice of Motion. Federal and California laws require that every child support order include an order for medical support. Find and Download official court forms for California Child Support. Ready to take the next step? Where Should You File for Child Support in California? Through the Petition for Custody and Support you are able to ask the judge to make orders regarding the issues of custody, visitation and child support only. It will be maintained in a confidential file with the State of California. It will be maintained in a confidential file with the State of California.