Lock external audio to video

I am editing a project in iMovie that is using audio recorded on a separate device than the video was shot on.  I have successfully synced the audio and video together with the use of hand claps at the beginning of the video.  My problem is now editing the project and removing the hand claps from the video.  How can I lock the video and external audio clip together so that I can trim the front and back of the project?  Right now, the video and audio are 2 separate pieces and trimming one does not trim the other.  Basically a reverse of the "detach audio" function that makes the camera audio a separate entity from the video clip.
I am not doing this as background audio as all videos that I saw on how to perform the sync did not do this as background audio.  Unfortunately, none of the videos show the step of trimming out the claps.
Thanks,
Roger

The real answer is to use Final Cut Pro. It has a feature that will automatically sync audio clips with video clips from multiple cameras. You could use this feature to automatically line up the external audio with your video clips. Once you do, you can edit your movie easily.
You can do this in iMovie, but it is a lot more of a manual effort.
1. When you add the audio, do not drop it in the background. Drop it on one of the first video clips. The sound file will appear as a ribbon beneath the video clips. You can easily drag it left or right, or trim it.
2. If you need to edit out stuff like hand claps, I suggest you first get the audio and the video lined up. Set the volume of the video clips to zero. Then Share the project. Use SHARE/EXPORT USING QUICKTIME. Choose Movie to QuickTime Movie. Choose Apple Intermediate Codec as the Video codec in the Options. Leave the audio codec as uncompressed.  This will create an .mov file in the Apple Intermediate Codec. You can use FILE/IMPORT MOVIE to import this file into an Event. Now the good audio is joined with the good video, and you can edit it like you are used to.
3. There is another way.  For simplicity, let's say you have an audio clip with song A, then applause and a pause, and then Song B. You can drag in your audio file twice, again - dropping it on a video clip rather than on the background. Then use the clip trimmer to trim away the back half of the audio clip (Leaving only Song A). Use the clip trimmer to trim away the front half of the other clip (Leaving Song B). Now you have two separate audio clips that you can move around
4. You can also accomplish the steps in #3 above by dragging in the audio clips twice, and then dragging the handles on the edges of the audio clips. Drag the front handle left to right to delete song A and leave Song B. Drag the right handle of the other clip to the left to delete song B and leave Song A.
Bottom line: it is easy in Final Cut Pro X. It is a kluge in iMovie.

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