File your initial pleadings, along with two full sets of copies, with the Family Law Business Office. The copies will be file-stamped and returned.Step-by-Step Guide to Filing for Child Custody in San Diego. The parent will need to file a Request for Order with the Family Court to establish custody and visitation orders or to modify the existing orders. Download and print child support forms, including income declarations, referrals, balance disputes, and others. Case Assignment Form: In San Diego County, a specific form must be filed to assign the case to one of the family law courthouses. Family Law Self-Help Information. Petition for (Custody) (Visitation). What Does Child Support Cover in California? Case Assignment Form: In San Diego County, a specific form must be filed to assign the case to one of the family law courthouses.