Re-import
If a file has changed since you imported it, you can re-import it.
In Explorer, right-click the imported task.
Select Edit task and click Finish. The Reader Settings dialog will appear.
Click OK. Since the import task has all the information needed from the previous import, it will now re-do the import with the latest version of the file (on the condition that the file name and path are still the same). Any information in the task can be changed before the Finish button is clicked. The procedure is the same as for Import files.