Hi, @Don Anderson
Following your way, I made a data table and inserted a line chart, when I moved it to Sheet2, changed the data in the data table, the line chart will automatically update the data.
I don't have a similar problem.
You can check whether the table is Convert to Range in Design, the screenshot is as follows:
Is your line chart moved to another Sheet under the original Excel file, or to a Sheet under the new Excel file?
To help you better, please provide a specific case and attach a screenshot.
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