Hi Roger, our themes are ultimately not designed to work in conjunction with another theme in the way that a plugin does, so the only way to allow functionality of both themes in one would be by way of customization on your part. Vantage already has a blog built into the theme which is separate from the listings (making use of WordPress custom post types), so working your code from the other theme into Vantage would technically be "easier" (although not necessarily easy), than the other way around. Thanks.