To add music in sections on Kuaishou, you need to use the cut function on Kuaishou. The steps are as follows:

1. First open Kuaishou and click the record button in the upper right corner, as shown in the picture.

2. Then in the entered interface, click the video button below, as shown in the picture.

3. After recording a video, click the Next button, as shown in the picture.

4. Then click the music button below, as shown in the picture.

5. Then click the music library button to open the interface, as shown in the figure.

6. Then select a song and click it, as shown in the picture.

7. Then click the use button below, as shown in the picture.

8. Then click the crop button inside, as shown in the picture.

9. Then listen to the song, move the white part below, listen to the music clip, and crop it. The white part is the length of the video, which is the right part, as shown in the picture.

10. Finally, click Next and publish the video there. We will use the cut music to publish the video, as shown in the picture.