If you want to delete some excess audio, use Trim.
In the Voice Memos app to check your edit, then adjust the trim handles if necessary.
Do one of the following:
Click Trim to remove everything outside the trim handles.
Click Delete to remove the sound between the trim handles.
Click Save to save the recording.
If you have a recording that you want to copy (either to leave as is or to edit), you can duplicate it.
In the Voice Memos app Share a voice memo on your Mac