This blog article and associated video shows how to manage Custom Child Object data in Oracle Sales Cloud using the File Based Loader.
Here is the video:
Custom child objects are used in the context of a parent object which effectively means that data entered to a child object is always associated with a row of data in the respective parent object. The ObjectKey of the parent row of data is stored with child rows of data.
To use the File Based Loader to import data for child objects, navigate to Setup and Maintenance and search for the Manage File Import task.
It's important to note that from Release 12 that to view and manage data within custom objects the Custom Object Administration security privilege will be needed by the executing user.
To learn more about the File Based Loader have a look at the links below :