I'm wondering if anyone knows of a plugin that will let you look at your Post Categories screen and drag all of the posts from one category into a different category.
I've tried changing category assignments with the Quick Edit method, but that causes the author's name to change to me. So far the only way I have found to manage which posts are in which categories without changing the author name is to open the Edit screen and change each post, which is slow. Looking for a fast way to manage category assignments w/o affecting the author info.
If nothing like that exists, maybe in a future update of WordPress this issue of the author name being changed when you quick edit can be looked into.