ITIL Chargeback examples and templates

I am looking for someone to provide me with a comprehensive guide and templates for the ITIL Chargeback process, specifically for Service Portfolio Management. The ideal candidate should have experience in ITIL Chargeback and be able to provide examples and templates that are easy to understand and follow. The templates should be in Microsoft Excel format, and the guide should be in Microsoft Word. The deliverables should include step-by-step instructions and templates that can be easily customized to fit my specific needs.