Log in to the system via account with basic data service administrator permissions and access System Mgt - Basic Data Service. Click "Create" to input information for the new data class in the pop-up. Click "Save".
Go back to the data class list. Select the created data class and click "View" under "Operations". In the pop-up. Click "Add Row". Input enumeration item information, then click "Save".
Click "Create Sub Level" to add child levels to the enumeration item, supporting multiple levels.