If there are just a couple of posts and you want to move from one category to another category:
- You can do it manually.
- Use the Bulk Move Plugin
This tool allows you to move all posts from one category to another. All you need to do is select category A in the left drop down menu and category B in the right drop down menu. After that just hit the Bulk Move button and the plugin will transfer all posts from category A to category B.
