sale_total_view/views/sale_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
   <data>
              <record model="ir.ui.view" id="view_order_line_tree_inherited">
                  <field name="name">sale.order.line.tree.inherited</field>
                  <field name="model">sale.order.line</field>
                  <field name="inherit_id" ref="sale.view_order_line_tree"/>
                  <field name="arch" type="xml">

                      <field name="price_subtotal" position="after">
                          <field name="multiplied_field" sum="Total G."/>
                      </field>
                  </field>
              </record>
    </data>
</openerp>