Hello

OpenERP version 6.1 ->

go to sale-sale.py->

def _prepare_order_picking(self, cr, uid, order, context=None):
    import ipdb;ipdb.set_trace()
    pick_name = self.pool.get('ir.sequence').get(cr, uid, 'stock.picking.out')
    return {
        'name': pick_name,
        'origin': order.name,
        'date': order.date_order,
        'type': 'out',
        'state': 'auto',
        'move_type': order.picking_policy,
        'sale_id': order.id,
        'address_id': order.partner_shipping_id.id,
        'note': order.note,
        'invoice_state': (order.order_policy=='picking' and '2binvoiced') or 'none',
        'company_id': order.company_id.id,
    }

############## Above code is general format how your data dynamically passes from sale order to your delivery order after confirming sale order. Now you can add your custom field here and your note value will be directly passes to stock.picking(delivery order form)

Example

class sale_order()

columns={'custom_note':field.text(My note)}

def _prepare_order_picking(self, cr, uid, order, context=None):
    import ipdb;ipdb.set_trace()
    pick_name = self.pool.get('ir.sequence').get(cr, uid, 'stock.picking.out')
    return {
        'name': pick_name,
        'origin': order.name,
        'date': order.date_order,
        'type': 'out',
        'state': 'auto',
        'move_type': order.picking_policy,
        'sale_id': order.id,
        'address_id': order.partner_shipping_id.id,
        'note': order.note,
        'invoice_state': (order.order_policy=='picking' and '2binvoiced') or 'none',
        'company_id': order.company_id.id,
        'custom_note_pick':order.custom_note #your comment dynamically passes to delivery order
    }

sale_order()

class stock_picking()

columns={'custom_note_pick':field.text(My note)}

stock_picking()