Hi,

Your question is very broad therefore I'm not able to give you exact advice. Generally Kentico CMS allows you to export BizForm data to Excel + Excel 2007. If you have some specific request then you need to create your custom function in code behind. For example you might want to use CustomDataHandler: http://kentico.com/docs/devguide/data_handler.htm

Best regards,
Vita Janecek