<inherit model="select.company" inherit="select_company">
    <field name="company" position="after">
        <field name="branch" selection="get_branch" attrs='{"invisible":[["show_branch","=",false]]}'/>
        <field name="department" selection="get_departments" attrs='{"invisible":[["show_branch","=",true]]}'/>
        <field name="show_branch" invisible="1"/>
    </field>
</inherit>