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I am not quite sure if I understand your concern correctly. Would you like to have a table excel displayed in your form or you want the submission data to be on a spreadsheet? We have a "Spreadsheet" widget that allows your users to have an excel like data input on your live form, although it does have its limitations.
You can also directly save your submissions in your Google spreadsheet by doing an integration. Here's a guide about it: http://www.jotform.com/help/228-How-to-Integrate-Form-with-Google-Spreadsheet
Let us know if that if your concern is different from the suggestions I have.