To open a business object definition that is stored in a local directory, do the following:
The Import dialog box opens. The dialog box defaults to filter files of type XML Schema Definition (with a .xsd extension). You can also select a different file type from the Files of type list or you can select all file types.
If the Open the imported business objects checkbox is checked then Business
Object Designer Express also opens the business object definition for
editing. Otherwise, the business object definition is imported into the
project but not opened for editing. For more information, see "Working with business object definitions".