Organizing categories is important.
There is a limit with only WordPress's default function to change / move category of multiple posts collectively.
With the default function, you can only add categories at once. It can not move or delete categories in bulk.
Using the plugin "Batch Cat", you can do it easily. This article summarizes the function and operation method of this plug-in.
Can not edit categories
This plugin can not edit name of categories or create a new one.
If you want to create a new category and move multiple posts there, you need to create a new category in advance.
To edit or create a category, click "Posts" → "Categories" in the WordPress menu and do it.
You can select multiple posts and move them collectively to categories different from the categories to which they currently belong.
You can select multiple destination categories. It can be said that it overwrites the category setting.
Although it can do with WordPress's default function, you can add categories to multiple posts at once.
You can delete categories of multiple posts at once.
When installing and activating the plug-in, the item "Batch Cat" will be added to "Tools" in WordPress menu. When clicked it, the screen will look like the following. (Blue and red lines are written by me)
From the part surrounded by the blue line, select the posts you want to move the category.
When checking the top □, all the displayed posts are selected. It is efficient to narrow down the posts and select them all together. (The method of narrowing down posts will be described later.)
Select the destination category from the part surrounded by the red line. (Multiple choice possible)
Finally, click "Set categories to posts" at the bottom left, and the category move is complete.
Clicking "Add categories to posts" adds the selected category without losing the original category.
Click "Drop categories to posts" to delete the selected category.
How to narrow down posts
If you select a category from the top "Category", only articles of the selected category will be displayed.
If you enter a keyword in the "Keyword" field, only the posts with keywords in that title will be displayed.
After setting the filtering conditions, you need to click "Search".
Changing the number of displayed items per page
In the default setting, only 15 posts per page are displayed. So, you can select up to 15 posts at once.
Increasing the number of display per page increases the number of batch edit.
Click "Settings" → "Batch Cat Settings" in the wordpress menu.
Since the following screen is displayed, change the number of "Posts per page".
Finally, click "Save Changes" to complete the setting.