I have models A and B:

class A (models.Model):
    _name = 'example.a'

    name = fields.Char(string="Model A")

    b_id = fields.Many2one('example.b', string='Model B')

class B (models.Model):

   _name = 'example.b'

   name = fields.Char(string="Model B")

    a_ids = fields.One2many('example.a', 'b_id', string="Models A")

I want to Add an item in a_ids from the existing records of A, not create new ones, how can this be achieved ? the autogenerated view for a_ids field only allows me to insert new records everytime I click Add an item, How can I show a list of existing records from the Many2One b_id field in model A. I though odoo will automagically show me a list of such values since the declaration of the field explicitly names the field in the Many2One relationship, thanks in advance