pos/pos_tare/views/templates.xml

<odoo>
    <template id="assets" inherit_id="point_of_sale.assets">
        <xpath expr="." position="inside">
             <link rel="stylesheet" href="/pos_tare/static/src/css/pos_tare.css"/>
            <script type="text/javascript" src="/pos_tare/static/src/js/tools.js"></script>
            <script type="text/javascript" src="/pos_tare/static/src/js/models.js"></script>
            <script type="text/javascript" src="/pos_tare/static/src/js/screens.js"></script>
        </xpath>
    </template>
</odoo>