whaze

Whaze Term Order for Posts lets you enable per-post custom ordering of taxonomy terms directly from the Gutenberg editor sidebar. Configure which post types and taxonomies are managed via the admin settings page, or register them programmatically in code.
Admin settings page:
Go to Settings → Term Order for Posts to enable term ordering for any post type / taxonomy combination — no code required.
For developers (optional):
Register a post type / taxonomy combination programmatically:
<pre><code>add_action( 'init', function () {
 whaze_term_order_for_posts_register( 'post', 'category' );
 whaze_term_order_for_posts_register( 'movie', 'genre' );
} );
</code></pre>
Retrieve ordered terms in templates or REST:
<pre><code>$terms = whaze_term_order_for_posts_get_terms( get_the_ID(), 'category' );
</code></pre>
Features:
<ul>
<li>Settings page to configure post type / taxonomy pairs — no code needed.</li>
<li>Opt-in auto-apply: custom order applied automatically to native blocks, classic theme functions, and any code using <code>get_the_terms()</code> — no template changes required.</li>
<li>Drag-and-drop reordering panel in the block editor sidebar.</li>
<li>Order saved automatically with the post — no separate AJAX call.</li>
<li>Falls back to default WordPress term order when no custom order is set.</li>
<li>Unused order entries are cleaned up automatically when terms are removed.</li>
<li>REST API field <code>term_order</code> for headless use cases.</li>
<li>Fully translatable (i18n-ready).</li>
</ul>

Whaze Term Order for Posts

Order taxonomy terms individually per post, directly from the Gutenberg editor sidebar.

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.

Whaze Term Order for Posts vs Bulk Add Terms