def METHOD_NAME(worksheet):
    # Adjust the column width for clarity.
    worksheet.set_column("A:A", 20)
    # Add the data, labels and formulas.
    worksheet.write("A1", "Region", bold)
    worksheet.write("A2", "North")
    worksheet.write("A3", "North")
    worksheet.write("A4", "North")
    worksheet.write("A5", "North")
    worksheet.write("A6", "North Total", bold)
    worksheet.write("B1", "Sales", bold)
    worksheet.write("B2", 1000)
    worksheet.write("B3", 1200)
    worksheet.write("B4", 900)
    worksheet.write("B5", 1200)
    worksheet.write("B6", "=SUBTOTAL(9,B2:B5)", bold)
    worksheet.write("A7", "South")
    worksheet.write("A8", "South")
    worksheet.write("A9", "South")
    worksheet.write("A10", "South")
    worksheet.write("A11", "South Total", bold)
    worksheet.write("B7", 400)
    worksheet.write("B8", 600)
    worksheet.write("B9", 500)
    worksheet.write("B10", 600)
    worksheet.write("B11", "=SUBTOTAL(9,B7:B10)", bold)
    worksheet.write("A12", "Grand Total", bold)
    worksheet.write("B12", "=SUBTOTAL(9,B2:B10)", bold)