Hello There 

Thanks for your reply.

However my cliente saw on another site where you can include a column on the invoice and put the percentage to get the discount.

That option is not offered anymore ?

Please let me know

Attached link and site that showed that option

https://quickbooks.intuit.com/learn-support/en-in/manage-customers-and-income/discount-by-line-item-...

Cheers

Jake