Court Forms: Petition to Modify Child Support. If you have an open case with the Division of Child Support, you can ask DCS to review your order for changes (called a modification).C. What if I have questions that this packet does not answer? Talk to a lawyer familiar with family law before filing anything with the court. Many. Download a free child support modification form to propose changes to a current child support agreement. Available in PDF or Word format. Use this to change a final child support order you got, for example, when you finalized your divorce or parentage case. Download Washington Child Support Modification template, modify and send for signing using BoloForms Signature. In summary, it says to write a simple letter to DSHS asking the agency to "register the support order for enforcement". By clicking the link in this sentence you can download an example child support order and worksheet from Washington State Superior Court.