If you are not able to match or verify your subcontractors automatically you can add in the verification code (obtained from HMRC) for the subcontractor manually.
Step 1.
Navigate to the Tax > CIS > Verification menu.
Step 2.
Click on the link within the text To manually enter a verification code click here.
Step 3.
Enter the verification in the box beside the appropriate subcontractor and hit the Update button.
Please Note: Manually verified subcontractors will not show a tax treatment, so please make sure to be using the correct CIS deduction rate when creating bills for the subcontractor.