[Python] Compute fields quantities from one model to another - Odoo v8

Consider these four models:

class bsi_production_order(models.Model):
_name = 'bsi.production.order'

name = fields.Char('Reference', required=True, index=True, copy=False, readonly='True', default='New')
date = fields.Date(string="Production Date")
production_type = fields.Selection([
('budgeted','Budgeted'),
('nonbudgeted','Non Budgeted'),
('direct','Direct Order'),
], string='Type of Order', index=True,
track_visibility='onchange', copy=False,
help=" ")
notes = fields.Text(string="Notes")
order_lines = fields.One2many('bsi.production.order.lines', 'production_order', states={'finished': [('readonly', True)], 'cancel': [('readonly', True)]}, string="Order lines", copy=True)
print_orders = fields.One2many('bsi.print.order', 'production_orders', string="Print Orders")

class bsi_production_order_lines(models.Model):
_name = 'bsi.production.order.lines'

production_order = fields.Many2one('bsi.production.order', string="Production Orders")
isbn = fields.Many2one('product.product', string="ISBN", domain="[('is_isbn', '=', True)]")
qty = fields.Float(string="Quantity")
consumed_qty = fields.Float(string="Consumed quantity")
remaining_qty = fields.Float(string="Remaining quantity", compute="_remaining_func")

@api.onchange('qty', 'consumed_qty')
def _remaining_func(self):
if self.qty or self.consumed_qty:
self.remaining_qty = self.qty +(-self.consumed_qty)

class bsi_print_order(models.Model):
_name = 'bsi.print.order'

name = fields.Char('Reference', required=True, index=True, copy=False, readonly='True', default='New')
date = fields.Date(string="Print Date")
origin = fields.Char(string="Origin")
production_orders = fields.Many2one('bsi.production.order', ondelete='cascade', string="Production Order")
order_lines = fields.One2many('bsi.print.order.lines', 'print_order', string="Order lines")

class bsi_print_order_lines(models.Model):
_name = 'bsi.print.order.lines'

print_order = fields.Many2one('bsi.print.order', string="Print Order")
production_orders = fields.Many2one('bsi.production.order', ondelete='cascade', string="Production Order")
isbn = fields.Many2one('product.product', string="ISBN", domain="[('is_isbn', '=', True)]")
qty = fields.Integer(string="Quantity")
consumed_qty = fields.Integer(string="Quantity consumed")
remaining_qty = fields.Float(string="Remaining quantity", compute="_remaining_func")

@api.onchange('qty', 'consumed_qty')
def _remaining_func(self):
if self.consumed_qty or self.qty:
self.remaining_qty = self.qty +(-self.consumed_qty)


So, production order has production order lines, and print order has it's order lines too (One2many order_lines fields)

There is a method on both of them, which are both called _remaining_func_.

These are OK for remaining_qty fields, but consumed_qty should be inter-related between production.order and print.order.

So, for example, if qty on bsi.production.order.lines is 10, (There are other methods which create a bsi.print.order from production order), and on bsi.print.order I put on qty the value 5, the original 10 should be 5 on bsi.production.order.line, I think with a similar method like _remaining_func_ I can achieve this, but how can I do this between the two models?

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