pos/pos_multiple_control/demo/res_groups.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (C) 2015 - Today: GRAP (http://www.grap.coop)
@author Sylvain LE GAL (https://twitter.com/legalsylvain)
License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-->

<odoo>

    <record id="account.group_account_manager" model="res.groups">
        <field name="users" eval="[
            (4, ref('base.user_root'))]" />
    </record>

    <record id="point_of_sale.group_pos_user" model="res.groups">
        <field name="users" eval="[
            (4, ref('base.user_demo'))]" />
    </record>

</odoo>