I am used the ease and utility of embedding an AE project in a Premiere timeline. I expected a similar functionality when beginning new complex work in Audition. But this isn't an option, and that surprises me. It would be very useful to be able to embed, or nest, projects inside of each other to create a larger project so that you can go back and change something in one of those projects without having to re-export it and re-link it in a master project. I would also think from an processing POV, that if you can embed AE projects, you should certainly be able to do that with an audio-only file.