amodoke

This plugin lets you Noindex Nofollow All Posts in a category. 
Simply go to Posts > Categories, and click on any category’s EDIT link. 
There you can just “tick” the relevant option you need. 
The plugin will then add a “noindex” or/and “nofollow” line in all posts in that category.
A few notes about the sections above:
<ul>
<li>DigitalChef.in – Madhu Ramrakhyani</li>
<li>This plugin lets you Noindex Nofollow All Posts in a category.</li>
<li>“3.0” is the lowest version that the plugin will work on</li>
<li>“4.7” is the highest version that you’ve successfully used to test the plugin. Note that it might work on 
higher versions… this is just the highest one you’ve verified.</li>
</ul>

NoIndex NoFollow  All Posts

This plugin lets you Noindex Nofollow All Posts in a category.

atomixstar

This plugin is based around the concept of lists. You can create a list, then assign posts to it. (A post can only be on one list.) When a list is created, you edit the blog posts and assign them to the list. When a blog post is assigned to a list, they can be listed in your blog posts.
This plugin differs from the other ones out there, because it does no magic! (And that’s a good thing). You have to create a list. Assign various blog posts to that list.
You have complete control of your related posts, making this plugin a great asset when you create a series of blog posts, with different parts or chapters.

My Related Posts

This plugin is based around the concept of lists. You can create a list, then assign posts to it. (A post can only be on one list.)

NoIndex NoFollow All Posts vs My Related Posts