Applying Online for Child Support Services. To start the child support services process, please complete the following steps.You can use the online portal to complete an application or visit a local North Carolina Child Support Services agency to complete the paperwork in person. Complete and attach Child Support Worksheet (AOC-CV-627, 628 or 629), as applicable, and Cover Sheet For Child. Support Cases (Non-IV-D Only) AOC-CV-640. County. This calculator determines the value of child support to be paid based on income, days the children spend in your custody, and other child-related expenses. Self-help forms you can fill out yourself that deal with issues like Child Custody, Domestic Violence, and many others. The NC child support calculator is another resource intended to help parents determine how much money they will pay in monthly child support. Answer our easy-to-follow questions. We'll guide you every step of the way.