A method is described for creating and managing a two-level hierarchical data structure. Parent and child object relation tables, an aggregate relation table and a link relation table having records are created wherein each link relation record has an aggregate identity field and a child object identity field and the aggregate relation records have a parent object identity field pointing to a parent object relation record. The link relation records have an aggregate identity field pointing to an aggregate relation record and to a child object relation record whereby zero or more child object relation records are linked to a parent object record relation record.