partner_history_sale/models/res_partner.py

# -*- coding: utf-8 -*-

from openerp import fields, models

class res_partner(models.Model):
    _inherit = 'res.partner'

    all_opportunity_ids = fields.One2many( 'crm.lead', 'partner_id', 'Leads and Opportunities')
    product_order_line = fields.One2many( 'product.order.line', "partner_id", string='product_order_line')