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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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The method I know that can achieve this is by extracting your multiple forms submission data into a consolidated output data.
You can use the JotForm Combine Submissions App to get an exported output data that contains multiple form's submissions.
The output data is in CSV file format.. but you can easily import the data to a spreadsheet format i.e. Excel or Google spreadsheet.. then you will now be able to create Sales Report using the spreadsheet. You can use the spreadsheets calculation/summary functionality to have sum data.
Hope this help. Please let us know if you need further assistance.
thank you so much :) it is ok now.