You can import Excel mappings by selecting the Import option and selecting an Excel mapping.
Note:
The import of mapping rules using an Excel template provides a place to specify a mapping script.
To import an Excel mapping:
Merge—Overwrites the data in the application with the data in the Excel data load file.
Replace-Clears values from dimensions in the Excel data load file and replaces them with values in the existing file.
The mapping inherits the default data load rule, and the description of "System Generated Mappings."