ReportBuilder, help with my company Invoice Template

SOLVED

I'm trying to adapt the template to our previous system layout for invoices. The data available for fields to be added in the template are not visible in the standard data tree. For example, we have different pricing for different customers but we want to display both the official price and the client's price on invoice (client's price will be sued for calculation of amounts). How do I create new queries to add fields to the template? Is there any courses or one on one training available to learn all these tricks?

Thanks for any help

Regards

Pedro