clinic/netforce_clinic/layouts/clinic_account_setting.xml

<form model="clinic.setting" title="Clinic Settings">
    <tabs>
        <tab string="Labor Cost">
            <separator string="Nurse"/>
            <field name="var_k"/>
            <field name="levels" nolabel="1">
                <list>
                    <field name="level_id"/>
                    <field name="var_a" onchange="onchange_line"/>
                    <field name="op" onchange="onchange_line"/>
                    <field name="var_b" onchange="onchange_line"/>
                    <field name="formular"/>
                </list>
                <form>
                    <field name="level_id"/>
                    <field name="var_a"/>
                    <field name="op"/>
                    <field name="var_b"/>
                    <field name="formular"/>
                </form>
            </field>
            <separator string="Doctor"/>
            <field name="cost_per_case"/>
        </tab>
        <tab string="Products">
            <field name="account_products" nolabel="1">
                <list>
                    <field name="product_id"/>
                    <field name="ar_debit_id"/>
                    <field name="ar_credit_id"/>
                </list>
            </field>
        </tab>
        <tab string="Matching Payment">
            <field name="patient_type_id"/>
            <field name="imp_patient_type_id"/>
        </tab>
    </tabs>
</form>