Contains links to help modify child support case. If you need assistance in completing forms to establish parentage, obtain child support, collect child support arrears or modify existing child support orders,Parents tell the court about their agreement to make an initial (the first) order for child support or modify (change) existing orders. Download the packet. With this service you will be able to submit completed forms electronically to the Contra Costa County Department of Child Support Services. The only way to legally change that order is to go back to the court that entered the order. Changes are usually called "modifications." Name Change Name Change Forms Packet Use the Interim Change Form available on our website or at the HCV office, to report all changes. 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.