Modify report in odoo contarct agreement module

In the contarct agreement module of odoo need to modify the report. Request is to add in 2 sections a table with the information related to the products in the sales order linked to it. Each product must be in only 1 section and this depend on the initial string of the internal_reference of the product itself. If the name of the product start with X_ it will be in the first list otherwise in the second list. Then need even the internal_reference , the quantity, the sell price for each one product and the totals. These information should be show in the report in a table with the column containing internal_reference, name, quantity, sell_price, etc. After that some minor modification of the report.. color, font and position of some information. The repository for these modules are in: [login to view URL]