partner-contact/partner_capital/views/res_partner_view.xml

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

<odoo>

<record model="ir.ui.view" id="view_partner_form_capital">
    <field name="name">Partner form with capital info</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_partner_form"/>
    <field name="arch" type="xml">
        <xpath expr="//page[@name='sales_purchases']/group" position="inside">
            <group name="capital"
                   string="Capital"
                   attrs="{'invisible': [('is_company', '=', False)]}">
                <field name="capital_amount"/>
                <field name="capital_currency_id"/>
                <field name="capital_country_id"/>
                <field name="turnover_amount"/>
                <field name="turnover_range_id"/>
                <field name="company_size"/>
            </group>
        </xpath>
    </field>
</record>

<record model="ir.ui.view" id="view_res_partner_filter_capital">
    <field name="name">Partner search with capital</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_res_partner_filter"/>
    <field name="arch" type="xml">
        <filter name="salesperson" position="after">
            <filter string="Capital country"
                    name="capital_country"
                    domain="[('is_company', '=', True)]"
                    context="{'group_by': 'capital_country_id'}"/>
            <filter string="Turnover"
                    name="turnover"
                    domain="[('is_company', '=', True)]"
                    context="{'group_by': 'turnover_range_id'}"/>
            <filter string="Company size"
                    name="company_size"
                    domain="[('is_company', '=', True)]"
                    context="{'group_by': 'company_size'}"/>
        </filter>
    </field>
</record>

</odoo>