match frame for synced audio

Couldn't find this in the forum: How do I match frame to the synced audio part of a clip?
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=143640
johnford wrote:To explain the reason for this: I have synced audio clips, of which the audio part of the external recorder is longer than that of the embedded audio of the video clips. So sometimes it would be nice to be able to use this "extra" audio of the external recorder, which gets truncated when autosyncing the clips.
jansur07 wrote:So you want to extend audio from recorder? Make it longer than clip from camera?
johnford wrote:jansur07 wrote:So you want to extend audio from recorder? Make it longer than clip from camera?
Yes, for example: someone continues to say something interesting which was not recorded on the camera clip, but I have the audio recorded. Then I want to use this audio with another image clip etc.