When you are copying a mapped object from one project to another and any of the projects has multiple name mapping configurations, you select target and source configurations in the Copy Multiple Configurations dialog:
The Target configuration column lists the name mapping configurations of the project to which you are copying your mapped object. For each target configuration, in the Source configuration column, select the configuration from which data will be copied.
If there is only one configuration in the source project, it will be selected in the Source configuration column automatically.
Click OK to copy the object. Click Cancel to cancel copying and close the dialog.