To create a new Matyoshka, select style and click Done. You can also open Matyoshka from the gallery, click Add button on the toolbar, select the style you'd like, and click Done.

Now that you have have two Matyoshkas, you can rearrange them using buttons "Move Inside" and "Move Outside" on the toolbar for moving Matryoshkas.

Click Save, and you'll have a Matryoshka inside another Matryoshka.