clinic/netforce_clinic/layouts/clinic_menu.xml

<menu string="Clinic">
    <item string="Dashboard" action="clinic_board"/>
    <item string="Visit" action="clinic_visit"/>
    <item string="HD Case Treatment" action="clinic_hd_case"/>
    <item string="Dialyzer" action="clinic_dialyzer"/>
    <item string="Personal">
        <item string="Doctors" action="clinic_doctor"/>
        <item string="Nurses" action="clinic_nurse"/>
        <item string="Patients" action="clinic_patient"/>
    </item>
    <item string="Settings">
        <item string="Departments" action="clinic_department"/>
        <item string="Clinic Setting" action="clinic_setting"/>
    </item>
</menu>