clinic/netforce_clinic/layouts/clinic_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="Testing">
            <group form_layout="stacked">
                <field name="file" span="3"/>
                <newline/>
                <button string="Make Visit" method="make_visit" span="2"/>
                <newline/>
                <button string="Make HD Case" method="make_done" span="2"/>
                <newline/>
                <button string="Complete HD Case" method="make_complete" span="2"/>
            </group>
        </tab>
    </tabs>
    <foot>
    </foot>
</form>