Hi naitsir. You can call create function when clicking on a button. So you don't need to click on Save button.

For example,

In sale order there is a button Confirm Sale. On clicking on this button you can add sale order line record by calling create method of sale.order.line.

def action_button_confirm(self, cr, uid, ids, context=None):
    sale_order_line_obj = self.pool.get('sale.order.line')
    order_line_id = sale_order_line_obj.create(cr, uid, {'name':'Hello','order_id':ids[0]}, context=context) // Sale order line created for current sale order

If you want to add products as per user's choice then you can create new wizard and add your required fields in wizard which need to be added in sale order line, in wizard button you can write your code that means whichever data was filled in wizard will be added in sale order line. Hope this way it will work.

Thanks

I check a lot of the code and I found an example of this on account.voucher form. For a Saler Order in my on_change function I need to res['value']['order_line'] = [{order line data1},{order line data2},...] where order line data is the all data related a sale.order.line then the client browser add all lines to my Sale order

this work for all forms with one2many, many2many fields :)

regards, and thank your for your help