C128Tools [ www.azalea.com/code-128/ ] includes sample Excel spreadsheets with macros that convert your spreadsheeet data in Code 128 & GS1-128 barcodes.
How to print Code 128 barcodes in your Excel spreadsheets using C128Tools. Use an Excel macro and Azalea Software's barcode fonts to convert your data into the equivalent Code 128 or GS1-128 bar code. http://azalea.com/code-128/excel/