如何修改已保存的Microsoft Access 2007或2010导入规范？

Does anyone know how to modify an existing import specification in Microsoft Access 2007 or 2010? In older versions there used to be an Advanced button presented during the import wizard that allowed you to select and edit an existing specification. I no longer see this feature but hope that it still exists and has just been moved somewhere else.Does anyone know how to modify an existing impo