Go to "I Music"-Find the audio-Click ":"-Ringtone-Set as Ringtone-Adjust the left and right starting positions-Select Set as Information Ringtone, and then go to "File Management"-Audio-View the audio file just cut.
If you have more questions, you can go to official website /vivo Mall APP-My-Online Customer Service or vivo official website Web Edition-Slide to the End-Online Customer Service-Enter the manual customer service for consultation and understanding.