You use the Import Member Mappings dialog box to import member mappings from external text files.
In the “Mapping file” box, you enter the path and file name of a mappings file, or you browse to and select a mappings file.
In the “Format settings” group, to assign a label to missing members (for example, to data-source members that are not in the data target), you select the Non-member box, and specify a label. By default, non-members are labeled as void.
In the “Format settings” group, you select an option:
Source column first—If the first column in the text file contains source member names
Target column first—If the first column in the text file contains target member names