The default behavior of this task is equal to the Create Record Task.
This task could be create Invoices, Quotes, … with selected Products. You could specify all values of these modules, like item/group tax or discount.
All other settings are equal to the default record creator.
You could select all products you have created in your vtigerCRM system. Also you could generate the product_id with a custom function. (Services are not supported at the moment)