# ImportDefinitionFieldMappingType

The strategies for mapping columns in an import file to fields in a data extension or list.

## Values

| Name                      | Description                                                                                                                                                                                                                                                                 |
| ------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `InferFromColumnHeadings` | Indicates that during the import, Marketing Cloud Engagement matches field headings in the import file to the data extension fields based on similarities in the text and values.                                                                                           |
| `ManualMap`               | Indicates that all relationships between fields in an import file and a data extension are explicitly stated in the API call.                                                                                                                                               |
| `MapByOrdinal`            | Indicates that during the import, Marketing Cloud Engagement maps fields from an import field to the data extension by their position in the file. Use a 0-based ordinal when importing to a subscriber list, and use a 1-based ordinal when importing to a data extension. |

## Related Items

- [ImportDefinitionFieldMap](/docs/marketing/marketing-cloud/guide/importdefinitionfieldmap.md)