I'm creating custom navbar links like so:
```
<record id="aboutus_page_link" model="website.menu">
<field name="name">About Us</field>
<field name="url">/page/about-us</field>
<field name="parent_id" ref="website.main_menu" />
<field name="sequence" type="int">10</field>
</record>
```
And am wondering if it's possible to create dropdowns within those links. Possibly creating a new record with some parent reference, or something?