Hengky Zhang, thank you for your answer. I finally have time to try this out but I ran into this problem.

Here's my code:

.py file:
class my_stock_production_lot(models.Model):
    _name = 'stock.production.lot'   
    _inherit = 'stock.production.lot'    
    product_available_qty=fields.Float(string='Quantity Available', related='product_id.qty_available')           

    @api.multi   
    def name_get(self):
        res = []       
        for lot in self:
            if lot.name:                  
                display_value = lot.name               
                if lot.product_available_qty > 0:
                    display_value += ' ['                   
                    display_value += '%.0f Units' % lot.product_available_qty                   
                    display_value += ']'               
                res.append((lot.id, display_value))        
        return res

.xml file:
<record id="view_pack_operation_lot_form_inherit" model="ir.ui.view">           
<field name="inherit_id" ref="stock.view_pack_operation_lot_form"/>           
<field name="model">stock.pack.operation</field>           
<field name="arch" type="xml">               
<xpath expr="//field[@name='pack_lot_ids']/tree/field[@name='lot_id']" position="replace">                   
<field name="lot_id" invisible="context.get('only_create', False)" 
        domain="[('product_id','=', parent.product_id)]"                                      
        context="{'product_id': parent.product_id, 'show_qty': True}"/>               
</xpath>           
</field>                   
</record>

My question:
1) Was I right on how to include 'show_qty' in the context of the .xml file?

2) I cannot reference  context in the name_get method. name_get cannot accepts a context parameter. When I checked the self._context variable in the debugger, I did not see {'show_qty': False}. I cannot  do "if self._context.get('show_qty'):..." either since it is a frozen dict. So how can I determine in name_get whether I should display the default name or my customize name[qty]???

Can you please explain possibly with example? Thanks.

Yes you can, but not same 100%

you override method name search in that many2one object

so you can override the return value

for default odoo just return the name of the relation table, and what you need to need to substring that name with the quantity example odoo will return --> LOT001(10QTY) instead of LOT001

for selection field you should use method to get the content of that selectional field and use your logical code for the return