pos/pos_ticket_without_price/static/src/xml/pos.xml

<?xml version="1.0" encoding="UTF-8"?>
<templates id="template" xml:space="preserve">

    <t t-extend="ReceiptScreenWidget">
        <t t-jquery=".button.print" t-operation="after">
            <div class="button print_ticket_without_price">
                <i class='fa fa-print'></i> Print Ticket Without Price
            </div>
        </t>
    </t>

    <t t-name="PosTicketWithoutPrice" t-extend="PosTicket">
        <t t-jquery=".pos-sale-ticket" t-operation="prepend">
            <div class="pos-center-align">
                TICKET WITHOUT PRICE
            </div>
        </t>
        <t t-jquery="tr[t-foreach='orderlines'] > td:nth-child(3)"
           t-operation="attributes">
            <attribute name="class">oe_hidden</attribute>
        </t>
        <t t-jquery=".receipt-total" t-operation="attributes">
            <attribute name="class">oe_hidden</attribute>
        </t>
        <t t-jquery=".receipt-paymentlines" t-operation="attributes">
            <attribute name="class">oe_hidden</attribute>
        </t>
        <t t-jquery=".receipt-change" t-operation="attributes">
            <attribute name="class">oe_hidden</attribute>
        </t>
    </t>

</templates>