var aspose = aspose || {};
aspose.cells = require("aspose.cells");
// Create an object of the Workbook class and load the source XLSX/XLS file. 
var wb = new aspose.cells.Workbook("sample.xlsx");
// Create another Workbook object. 
var excelWorkbook1 = new aspose.cells.Workbook();
// Copy the first sheet of the first book into second book by calling the copy(source) method. 
excelWorkbook1.getWorksheets().get(0).copy(wb.getWorksheets().get(0));
// Invoke the save method to save the file.  
excelWorkbook1.save( "CWBetweenWorkbooks_out.xls", aspose.cells.FileFormatType.EXCEL_97_TO_2003);