Xway doesn't read Freeway documents yet. That's something we plan to do, but we're working on core functionality that needs to be in place first.
It's possible to recreate a Freeway site by hand if you copy/paste text and reimport images (essentially the same method that you would use to recreate a non-Freeway site within Freeway).
If you do this, it's a good idea to create a page layout that displays flexibly on different devices, rather than recreate an inflexible Freeway layout. It's possible to create a flexible layout in Freeway, but it's much easier to do this in Xway.