flectra/addons/sales_discount/views/res_config_settings_views.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
    <record id="res_config_settings_view_discount_form" model="ir.ui.view">
        <field name="name">res.config.settings.view.form.inherit.discount.sale</field>
        <field name="model">res.config.settings</field>
        <field name="priority" eval="3"/>
        <field name="inherit_id" ref="sale.res_config_settings_view_form" />
        <field name="arch" type="xml">
            <xpath expr="//div[hasclass('settings')]/div[hasclass('app_settings_block')]/div[1]" position="after">
                <h2>Sale Order Discount</h2>
                <div class="row mt16 o_settings_container">
                    <div class="col-xs-12 col-md-12 o_setting_box">
                        <div class="o_setting_left_pane">
                            <field name="global_discount_per_so_invoice_line"/>
                        </div>
                        <div class="o_setting_right_pane">
                            <label for="global_discount_per_so_invoice_line"/>
                            <div class="text-muted">
                                Allow global discount on the sale order
                            </div>
                            <div attrs="{'invisible': [('global_discount_per_so_invoice_line' ,'=', False)]}">
                                <div class="o_setting_left_pane">
                                    <field name="global_discount_apply"/>
                                </div>
                                <div class="o_setting_right_pane">
                                    <label for="global_discount_apply"/>
                                </div>
                            </div>
                            <div attrs="{'invisible': [('global_discount_apply' ,'=', False)]}">
                                <div class="o_setting_right_pane">
                                    <label for="global_discount_fix_amount"/>
                                    <field name="global_discount_fix_amount" attrs="{'required': [('global_discount_apply', '=', True)]}"/>
                                </div>
                                <div class="o_setting_right_pane">
                                    <label for="global_discount_percentage"/>
                                    <field name="global_discount_percentage" attrs="{'required': [('global_discount_apply', '=', True)]}"/>
                                </div>
                            </div>
                            <div class="content-group" attrs="{'invisible': [('global_discount_apply','=',False)]}">
                                <div class="mt16">
                                    <button name="%(sales_discount.action_sale_discount_config)d" icon="fa-arrow-right" type="action" string="Group Leval Discount Configuration" class="btn-link"/>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </xpath>
        </field>
    </record>
</flectra>