Thank you 

HI,
Either by studio or using server action, you can add the option to multi confirm from the list view to confirm all the quotation at once.

See:  https://www.youtube.com/watch?v=_E-lxkawlbs

Thanks

Hello,

To update a quotation to a sale order, you need to execute the following SQL query:

UPDATE sale_order SET state = 'done' WHERE id IN (...);

To create an invoice, you should implement a function like this:

sale_orders = self.env['sale.order'].search([('invoice_status', '=', 'to_invoice')])  

for order in sale_orders:  

    order.action_post()