Systems and methods for managing integrated and customizable data

In one of many possible embodiments, an exemplary system includes a data integration subsystem including at least one base hierarchical data structure representative of a first set of one or more data relationships. The system further includes a customization subsystem configured to receive one or more commands from an external source. The commands represent a second set of one or more data relationships, the second set of data relationships being externally defined. The customization subsystem is further configured to generate, based on the commands, a custom hierarchical data structure representative of the second set of data relationships, the second hierarchical data structure being generated on top of at least a subset of the base hierarchical data structure.