When you enter import specifications and use the Save As command from the File menu, you are saving the contents of the Import window. The saved file is a Batch Import file containing one import transaction. It has an .imp file name extension. A Batch Import file can also be created using any ASCII text editor. You can preview how an import specification would look as a batch file by clicking on Batch Import Commands from the View menu.
Batch Import is particularly useful when you have a number of similar files to import, or when you import the same files on a regular basis. Once you have created a Batch Import file, you may use it over and over, with or without modification.