manufacture/mrp_unbuild_subcontracting/views/mrp_unbuild_views.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <record model="ir.actions.act_window" id="mrp.mrp_unbuild">
        <field name="domain">[('is_subcontracted', '=', False)]</field>
    </record>

    <record model="ir.actions.act_window" id="mrp_unbuild_subcontracted">
        <field name="name">Unbuild Orders - Subcontracted</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">mrp.unbuild</field>
        <field name="view_mode">tree,kanban,form</field>
        <field name="domain">[('is_subcontracted', '=', True)]</field>
        <field name="help" type="html">
          <p class="o_view_nocontent_smiling_face">
            No unbuild order found
          </p><p>
            An unbuild order is used to break down a finished product into its components.
          </p>
        </field>
    </record>

    <menuitem
        id="menu_mrp_unbuild_subcontracted"
        name="Subcontracted Unbuild Orders"
        parent="mrp.menu_mrp_manufacturing"
        action="mrp_unbuild_subcontracted"
        sequence="21"
        groups="base.group_no_one"
    />
</odoo>