An importation tool is disclosed that enables importation of configuration item (CI) data into a configuration management database (CMDB) from external services. The CMDB importation tool includes corresponding predefined configurations for particular external services that define how the data collected by the external services is imported into the CMDB, either directly or via one or more transformations, enabling importation of external service data regardless of the format or schema used by the external service. The CMDB importation tool enables relationships to be defined between attributes of the imported data, and ensures that these relationships are enforced during the importation process to provide improved internal consistency of the imported data. Additionally, certain CMDB classes may be modified with specialized fields to enable improved duplicate tracking and management within the CMDB. As such, these techniques enhance both the quantity and quality of CI data stored within the CMDB.