odoo_/cat_app/library_member/views/book_view.xml

<odoo>
    <record id="view_form_book_extend" model="ir.ui.view">
        <field name="name">Book: add Is Available? field</field>
        <field name="model">library.book</field>
        <!-- 继承library_app中ID为view_form_book的视图 -->
        <field name="inherit_id" ref="cat_app.view_form_book" />
        <field name="arch" type="xml">
            <!-- 指定添加位置，ISBN之后 -->
            <field name="isbn" position="after">
                <!-- 要添加的新字段is_available -->
                <field name="is_available" />
            </field>
        </field>
    </record>
</odoo>