Magento - Custom subtotals invoice / order & custom reports

I need to show on the e-mail (PDF) invoices / orders the subtotals for each parent category. i.e. I have currently 2 parent categories - 1. Meat & 2. Cakes and on the invoice / order / shipment I need to see (anywhere) a breakdown of the cost (ex VAT) per category. Additionally to this I need to develop a custom report for orders received as described below: Print order received by specify date showing all products ordered sorted by category, subcategory but also showing customers in columns. See file attached to get an idea what we would like to see on the report.