Good day, darrencryer-gmai.
I understand that you need to create an invoice as a CIS sub contactor. We're unable to track CIS transactions in QuickBooks Self-Employed. You'll want to switch to QuickBooks Online instead.
Please check this article for more details: CIS in QuickBooks Online.
Also, I suggest reaching out to our Customer Support Team so they can further assist you and see if there's a workaround in QuickBooks Self-Employed.
Post again here if you have more questions. Stay safe!