model_wizard.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record model="ir.ui.view" id="custom_report_wizard">
    <field name="name">Custom Report</field>
    <field name="model">report.wizard</field>
    <field name="type">form</field>
    <field name="arch" type="xml">
        <form string="Custom Report">
            <group>
                <group>
                    <field name="date_start"/>
                </group>
                <group>
                    <field name="date_end"/>
                </group>
            </group>
            <footer>
                <button name="download_report" string="Download Report" type="object" class="oe_highlight"/>
                <button string="Cancel" special="cancel"/>
            </footer>
        </form>
    </field>
    </record>

    <act_window id="action_custom_report_wizard"
                name="Action Custom Report"
                res_model="report.wizard"
                view_mode="form"
                target="new"/>

    <menuitem action="action_custom_report_wizard"
              id="menu_custom_report_wizard"
              parent="hr_expense.menu_hr_expense_reports"/>

</odoo>