Maybe you could put another sheet in the workbook. This sheet would only have one column of data. It would lookup the latest last column of the working worksheet. And you could import this new sheet which will just be the latest data.
Thank you for your reply. Your way is achievable, but I hope to achieve my goal without more manual steps( the script is used by someone knows little about technical things). It's required that the user just press the button and the script of filemaker will do all.