Go to Setting > Payers . Find the Payer you wish you edit and click the three dots to the right of the payer, and select "edit".
Next, select "Compliance/Billing Rules:
Then, you will see this option for "Apply Assistant Modifier" as shown below, select yes.
With these settings turned on, the PTA will be notified on every note for the payer with these settings turned on that the CQ modifier will be auto applied.