Data Management Capabilities > Using Packages to Import and Export Data for Offline Collaboration > Define Mapping
  
Define Mapping
The Mapping Management utility establishes attribute mappings for select object attributes on a per-source-system basis rather than for each received delivery. This allows the same mappings to be used for all deliveries received from the same source system and cuts down on the time required to administer data exchange.
The Define Mapping step is best used in parallel with the Preview Import step in the process flow. The preview step allows you to identify areas that require mapping. After defining attribute mappings, it is recommended that you preview the import again to ensure that all mapping-related issues have been addressed.
If you would prefer, you can also define mappings using a load file rather than using the Define Mapping action.