Hi,
I want to alter the functionality of sale order form, what I want to do is whenever a new sale order is to be create the one2many order_lines treeview should contains some default field rows as shown in linked figure, which are then inserted into the relation model on save.
https://drive.google.com/file/d/0BwpBdLTvPsQtWkJPdUN0YjVPZjQ/view?usp=sharing