Try this module to create the spreadsheets with the custom format:
http://search.cpan.org/~jmcnamara/Excel-Writer-XLSX-0.10/lib/Excel/Writer/XLSX.pm

This module works with Excel 2007 +. The Spreadsheet::WriteExcel module written before version 2007 was excellent, as was the parser, so John McNamara++.

Please give us an example of what you are trying to format in Spanish and English if you need more specific help.

Enjoy!


Dawn