Try Like this ...

class MyModelFoo1(models.Model):
    _name = 'my.model.foo'

    my_field1 = fields.Char()
    my_field2 = fields.Char()
    my_field3 = fields.Char()

class MyModelBar(models.Model):
    _name = 'my.model.bar'

    my_field4 = fields.Char()
    my_field5 = fields.Char()
    my_field6 = fields.Char()

class MyModelFoo2(models.Model):
    _name = 'my.model.foo'
    _inherit = ['my.model.foo', 'my.model.bar']

Here fileds of 'my.model.bar' will come under 'my.model.foo'.

Thanks !!!  

iWesabe

hello 

for inherit only one field you can achieve this using  _inherits.

_inherits = {}              # inherited models {'parent_model': 'm2o_field'}

for eg. you can do like below code (in odoo there is already example in res.users object):

class Users(models.Model):
    _name = "res.users"
    _inherits = {'res.partner': 'partner_id'}

class ResUsers(models.Model):

_inherit = "res.users"

    age = fields.Float(string="Age")