Navigate to > Setting > Manage Users
Now select an Assistant user and Change the Assistant Type to PTA or OTA
Now login with the Assistant User and go to Edit Payor page (The Payor who is added in the Patient's Information page) and check the check box Add CQ/CO modifier:
Then go to the patient Financial Information page, enter the Payor in the Primary Insurance field and save the data.
Once this is done, create any SOAP note and finalize a billing page, here the modifiers column will display CQ if the Assistant Type is PTA and CO if the Assistant Type is OTA: