Hi Ahmad,

You can add a onchange function for the selection field in the first model, let it be model A, then inside the the onchange function you can access the other model, let it be model B and can change the record accordingly.

@api.onchange('test_field')
def test_function(self):
    model_b_rec = self.env['model_b']
    new_employee = model_b_rec.create({
        'name': self.name,
    })

Thanks