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akram

when the user select the "Aérrienne" option i just want to add new options to the type_transport select


```python

mode_transport = fields.Selection([ ('Routière\Maritime','Routière\Maritime'), ('Routière','Routière'),('Aérrienne','Aérrienne') ],string="Mode de Transport") type_transport = fields.Selection([('test1','test1')],string="responsible") 

@api.onchange("mode_transport")

def _set_type_transport(self):

 if self.mode_trasport == False : 

  pass

 elif self.mode_transport == 'Aérrienne' : 

  self.type_transport = fields.Selection(add_selection=[("new option","new option")])

```


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m-azzain
Best Answer 
_type_transport = [('test1','test1')]

mode_transport = fields.Selection([('Routière\Maritime', 'Routière\Maritime'), ('Routière', 'Routière'), ('Aérrienne', 'Aérrienne')],string="Mode de Transport")
type_transport = fields.Selection(lambda self: self._type_transport,string="responsible")

@api.onchange("mode_transport")
def _set_type_transport(self):
    if self.mode_trasport == False :
        return
    elif self.mode_transport == 'Aérrienne' :
        self.type_transport =self._type_transport.append(("new option","new option"))

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m-azzain

You need to check to see if the option has already been added, such case may happen when you select the same option more than once.
And also you page need to be reloaded for the added options to show.

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