These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. Spousal support cases are started with a spousal support petition in Family Court.There is no filing fee in Family Court. I do not wish to apply for child support services. â–ˇ I am not eligible to apply for child support services because I am petitioning for spousal support only. 8. OCSS services include assistance with locating noncustodial parents, establishing parentage, establishing child support and medical support orders. This online program from Family Legal Care guides you through filling out an Affidavit in Support. How do I apply for Child Support Services? You can complete the application at your local CSS office or apply online. Click on the word "forms" at the top center of the page and then type in the form number "CV-.