Yes there is a link on that page that shows how to create multiple portfolio pages – http://appfinite.com/tutorials/how-to-create-multiple-portfolios/
It’s based on categories. You can either have them all on one page, or each one on separate pages. Also, if you want to exclude your portfolio posts from showing up in your blog then you can add the IDs to exclude in your Genesis Theme Settings page under the Blog Page Template section.