Migrating from an older version to the most recent directory version

I’ve updated an existing link site with the most current directory theme. In the old version, links and categories were listed as “posts”. After I updated the site to the newest version, the links are now in the “blog manager” section. The links need to be in the “listing manager” section. How can I get the existing links and categories from the blog section to the listing area? What’s the best way to complete this change?