What do you mean by import the game?
OH, well. The way that Twine works is that it uses cookies to store your save in the browser, so I'm not entirely confident that you'll be able to move it over directly (depending on how your browser is set up it might be a thing, but as far as I know it isn't). The build a save feature is meant to allow you to start from where you were though, while setting all the necessary variables!