suite/account_us_ca_salestax/views/account_fiscal_position_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record id="account_position_us_ca_inherit_from_view" model="ir.ui.view">
        <field name="name">account.fiscal.position.form.inherit</field>
        <field name="model">account.fiscal.position</field>
        <field name="inherit_id" ref="account.view_account_position_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='name']" position="after">
                <field name="is_us_ca"/>
                <field name="ca_base_tax_id" attrs="{'invisible': [('is_us_ca', '=', False)]}" />
            </xpath>
        </field>
    </record>

    <record id="view_tax_form" model="ir.ui.view">
        <field name="name">account.tax.form.inherit</field>
        <field name="model">account.tax</field>
        <field name="inherit_id" ref="account.view_tax_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='description']" position="after">
                <field name="ca_county" />
                <field name="ca_location_zips" />
            </xpath>
        </field>
    </record>

</odoo>