add line of title to the sale

sale.py

@@ -23,8 +23,13 @@ class Sale(metaclass=PoolMeta):
     @classmethod
     @ModelView.button
     def add_pizza(cls, records):
+        pool = Pool()
+        saleLine = pool.get('sale.line')
         for record in records:
+            #raise UserError(str(record.lines))
             record.pizza_number +=1
+            record.lines += (saleLine(type="title",
+                                           description="Pizza Combinada"),)
             record.save()