Building a Custom call flows will give your business the ability to route calls to the necessary line. You can modify your call flow using various options like Play message, Call transfer, Group calls, Capture digits, SMS, Hang up. It allows users to create flexible self-service phone menus.
Click on “Add Call Flow” to begin creating your own custom call flow.
Give that callflow a name, save it.
You can refer to the custom call flow documentation here UC Editor.