Insert in a new track?
I don't think so. I've started an audio book and I'm doing chapter long segments (assuming I can make simple corrections, such as ones made in iMovie and numerous other video editing programs. Routine edits in GB are simple and intuitive. I cannot wrap my mind around the fact that I'm prevented from doing a simple drag and drop, import or paste a two-sentence audio clip. Nor can I find any reference to straightforward audio elements.
Any suggestions you might have would be appreciated.