The Add to database function is useful when you have sent a Teach file to support and got a .bin file in return.
Use Shift-Ctrl-alt-A in BOS (not Dupsoft) to display the dialog to the right. Make sure that you have the index type correctly set and leave the Force deck name unticked.
Drag and drop the file into the box in the dialog and wait for the import to be completed.
Note that the import takes a while and that you need to wait for an OK message to appear after each import to avoid problems.