Yes, there are a couple of ways to add a checkbox to each product row in Odoo:

1. Override the create invoice line function: This method involves modifying the function that creates invoice lines to only create an invoice for the checked lines.

1. Create a new model: Another approach is to create a new model with the same fields as 'sale_order_line' and add your additional fields (including the checkbox) there. You can then add functionality so that if the checkbox is enabled, that line will automatically be added to 'sale_order_line'. If the checkbox is disabled, the line will be removed from 'sale_order_line'. This will require overriding the 'create', 'write', and 'unlink' functions of that model.