ELsMystERy

Easy Taxonomy Support, by <a href="http://spectrumvisions.com" title="Spectrum Visions" rel="nofollow ugc">Spectrum Visions</a>, makes it easy to add post tag and category support to pages and custom post types.
Custom post type support will prevent post tags and categories that are associated with custom posts from returning “nothing found”, or 404 errors. With the page tags and/or categories enabled, you can add tags to pages and assign pages to categories.
<h3>Show the Love</h3>
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Features
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Add tags and categories to WordPress pages.
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Allows tags on custom post types with the “post_tag” taxonomy to function without producing errors.
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Page tags will show up in your tag cloud.
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Interacts with <a href="https://wordpress.org/plugins/q-and-a-focus-plus-faq/" title="Q & A Focus Plus FAQ" rel="ugc">Q & A Focus Plus FAQ</a> so that tags on FAQs are not broken if Easy Taxonomy Support is deactivated.
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Easy Taxonomy Support does not:
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Add the “post_tag” or any category taxonomies to registered custom post types. Custom post type support only works if you can already add tags to custom posts.
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Display categories or tags at the bottom of pages.
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Clean your house, mow your lawn, or improve your love life. If we can add these features in the future, we will.
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</ul>

Easy Taxonomy Support

Use post tags and categories with pages and custom post types.

Sohan Zaman

Have you ever been frustrated adding more and more categories or tags or any other terms in a rush? Don’t worry anymore. You can add thousands of terms in one go with this plugin.
<h3>How do I do that?</h3>
<ol>
<li>Install the plugin and activate. A new menu called ‘Add Bulk Terms’ will pop up.</li>
<li>Click on the menu and you’ll be taken to a new page where you will see all the registered taxonomy either by theme or any plugin.</li>
<li>First select a taxonomy which you want to add terms.</li>
<li>Then insert the terms in the right side textarea. Make sure each line contains only one term.</li>
<li>Click on ‘Add Now’ button. A little confirmation will pop up just to make sure you have inserted everything correctly. Click yes and BOOM. All terms are added.</li>
</ol>
<h3>What about nesting parent and child?</h3>
This plugin supports to do that. You can go and do nesting. You can indent child levels with a dash (-). For example:
<pre><code>Foo
-Bar
-Baz
</code></pre>
In the example above, ‘foo’ will be parent while ‘bar’ and ‘baz’ will be child of it. 
You can use correct indent to make even more child of child. Example:
<pre><code>Foo
-Bar
--Baz
</code></pre>
Complex nesting example:
<pre><code>Foo
-Child of Foo~~foo-custom-slug
--Grand child of Foo~~grand-child-slug
-Second child of Foo
Baz is sibling of Foo
-Nephew of Foo
--Grand child of Baz
--Second grand child
-Son of Baz
-Daughter of Baz~~daughter-custom-slug
I am a lonely term
Do not have child
</code></pre>
Unfortunately the maximum supported level is as deep as the SEA.
<h3>Features</h3>
<ul>
<li>Unlimited terms per time</li>
<li>Unlimited level of nesting</li>
<li>Supports any registered taxonomy. (only those which can be added or removed within UI)</li>
<li>Uses AJAX request</li>
</ul>
version 2.0 update 
* Custom slugs for each terms. Use the <code>~~</code> symbol to seperate name and slug. 
* Get all terms from selected taxonomy as a template. Later, use that template to add them to another taxonomy. 
* Remove all terms that were added by the plugin from selected taxonomy. (Requires at least WordPress 4.4 and plugin version 2.0 when Adding and deleting the terms)
<h3>Known issues</h3>
<ul>
<li>You can’t add child items to those terms which are already added. If you try to do, the given parent item will add as a new term.</li>
</ul>
GitHub repository: https://github.com/sohan5005/bulk-add-terms

Bulk Add Terms

A lightweight plugin to add thousands of taxonomy terms in one go.

Easy Taxonomy Support vs Bulk Add Terms