You can use external references in formulas, such as data from an xlsx file.
The external reference uses the file name and sheet. For example: 'C:\\Mescius\\[Sum.xlsx]Sheet1'!.
The following example references data from a file.
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fpSpread1.Sheets[0].SetFormula(0, 0, "SUM('C:\\Program Files (x86)\\Mescius\\[Sum.xlsx]Sheet1'!A1:A4)");
fpSpread1.AllowUserFormulas = true;
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FpSpread1.Sheets(0).SetFormula(0, 0, "SUM('C:\Program Files (x86)\Mescius\[Sum.xlsx]Sheet1'!A1:A4)")
FpSpread1.AllowUserFormulas = True
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