eiru_base_menu_rrhh/menu_rrhh.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <!-- menu dentro de Operaciones -->
    <menuitem
          id="hr_payroll.menu_hr_root_payroll"
          parent="eiru_base_menu.menu_operations"
          name="RRHH"
          sequence="40"/>

          <record model="ir.ui.menu" id="hr_payroll.menu_hr_root_payroll">
       <field name='name'>RRHH</field>
   </record>

    <!-- menu dentro de Registros -->
    <menuitem
          id="hr.menu_hr_main"
          parent="eiru_base_menu.menu_registrations"
          name="RRHH"
          sequence="50"/>
          <record model="ir.ui.menu" id="hr.menu_hr_main">
       <field name='name'>RRHH</field>
   </record>

  </data>
</openerp>