Where are the [Billing Code] setting?

[Shelin]

After updating v20, where do I change the following settings of the billing code?

https://www.3cx.com/docs/pbx-dial-codes/#h.ihqaztatq9vr

 

[Alphabetic]

System > Dial Codes

 

[Shelin]

Thank you for reply.
So [Match Billing Code] = (V20) System > Dial Codes > Billing code prefix ?