Define a default category for each new post before it is saved.
Plugin Tag: category
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Select Category to Post
Category names are shown on your dashboard with a hyperlink, and when you click one, you will go to post-new.php, with the category already selected.
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Smart Category Ordering
Allows you to alphabetize categories by post title, by trimming leading text, by post date.
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WP Select Primary Category
WP Select Primary Category plugin allows you to select a primary category for different posts and custom post types.
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Posts in Posts
Posts in Posts grabs posts based on tag, category or just recent, and display them inline with a post
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Recent Posts From Each Category
Display Recent Posts From Each/Selected Category. Category Box View Plugin.

