File a court motion to modify child support in Michigan if it has been less than 36 months since the last order review. Keep this form separate from the other forms.To modify child support in Michigan, download a "do-it-yourself" packet from the Court of Justice. Fill out a Uniform Child Support Order using the calculation results and file it as a proposed order along with your motion. To modify child support in Michigan, file a motion to modify support form (found on this website) or file a motion to modify support. Fill in your FULL CASE NUMBER on your Court Order in the upper right box on the MOTION form and the RESPONSE form. 2. To modify child support obligations in Michigan, file a Motion Regarding Support (Form FOC 50) with your local FOC. For use when deviating from the child support formula. Click Here for instructions on how to fill this form out. Org and clicking on the Forms tab.