I understand how selecting each checkbox individually can be time-consuming, Alison. Currently, the 'Select All' option for sending CIS statements is unavailable in QuickBooks Online (QBO). I'll provide some insights about this.
We are always looking to enhance the functionality of our software, and I appreciate you bringing this to our attention. In the meantime, you will need to manually select each to submit the statements.

Additionally, you can run three reports in the program to view details of the payments made to subcontractors, a statement that breaks down all the payments with deductions, and a summary of the CIS deductions withheld by your contractors for the selected period.
If you have any more questions or further concerns about the CIS statements, please feel free to circle back to this thread.