The setting that allows a parent-child relationship among custom record values of the same record type in NetSuite is "Hierarchy." This setting enables the creation of hierarchical relationships within a single custom record type, allowing records to be organized in a structured manner, resembling a tree-like hierarchy. By utilizing the hierarchy setting, administrators can define records as parents or children of other records within the same type, facilitating organized data management and navigation. This is particularly useful for categorizing data, managing related records in a consolidated manner, and supporting more complex data structures within custom applications or processes built in NetSuite.References: NetSuite Help Center, Custom Record Documentation.V