How can I get a previous SubContractor invoice to appear on CIS form to 5 August 2020?

Hello Hardleyrosie53, 

Welcome to the Community page, 

You would need to put the transactions in the CIS period ending 5th August. However, it might need to get unfiled depending on how the new CIS system in Quickbooks picks up the marked as filed period. 

Just to make you aware that you aren't going to try and submit your July CIS period through Quickbooks as we can only submit the periods starting from the 06/08/2020.