We would like to extend the sale order views with duplicate icons for each line item as well as complete sections.

We are currently extending the line items like this by extending the view sale.view_order_form:

xpath expr="/form/sheet/notebook/page[@name='order_lines']/field[@name='order_line']/tree" position="inside"

button name="action_duplicate_line" icon="fa-copy" type="object"

/xpath

(Apologies for not formatting correctly - it looks like Odoo does remove all tags here).

However, this only works for line items, not for sections. I am aware that they have a different display_type​, but how can we extend the view to add the duplicate icon to lines with the display_type=line_section​?