My client has one ltd company but uses 2 different trade names. I want to be able to send invoices with alternate trade names. How do i set this up in QBO please?

Hello Jenny19, 

Welcome to the Community page, 

So you can use the invoice template in Quickbooks for one of the company names and then import a invoice template for the other company name, then when you create a invoice when you click on customise you can select which template you need to use.