Reverse Charge and CIS - Sub -Customers. Do I need to tick the CIS Registered box for all sub-customers of a Parent Customer who already has the CIS Registered box ticked

Yes, @info1521.

You can tick the CIS box for all of your sub-customers since the name on each transaction will be the source of reporting in QuickBooks Online. For more info, please see this article: Construction Industry Scheme.

Also, QuickBooks offers self-help articles that will guide you to finish your tasks in no time. To start browsing, go to our QuickBooks help page at this link.

If you need further assistance with this, please post a response below. I'm always here to help you. Have a good one.