I've added many fields on pos.session with a custom module, and I would like to create a second view.

   <record id="pos_session_tree_adm2" model="ir.ui.view">
       <field name="name">pos.divina.custom.tree.view.adm2</field>
       <field name="model">pos.session</field>
       <field name="arch" type="xml">
           <tree string="Sessions" create="0">
               <field name="start_at" />
               <field name="name" />
               <field name="day_sold" />
               <field name="day_costs" />
               <field name="day_margin" />
               <field name="state" />
           </tree>
       </field>
   </record>

   <record id = "pos_session_tree_adm2" model = "ir.actions.act_window">
       <field name = "name">Sessions</field>
       <field name = "type">ir.actions.act_window</field>
       <field name = "res_model">pos.session</field>
       <field name = "view_type">form</field>
       <field name = "view_mode">tree,form</field>
       <field name = "view_id" eval= "False"/>
    </record>

Problem is the original pos.session tree will be substituted and Odoo will use mine instead (on both places on menu). Then is pretty obvious I'm doing something wrong here.
Since is the first time I need to create a duplicated view I'm a bit confused, what is the best way to archive what I want?