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Common Links allows you to add regularly used links to the search results when linking text content of your post.
Add your common links from the Tools menu. Then, when linking content, begin typing the link title or URL to pull up and insert the link.
Note: Entering <code>.</code> when querying links will not return results. Use spaces instead to match URLs.

Common Links

Adds custom links to the editor's link query

Pawel Cmachowski

Plugin is extension for WooCommerce plugin.
Plugin allows you to create multiple External / Affiliate product URLs and buttons text.
Plugin creates extra fields on External / Affiliate product edit form, with repeater of multiple external URLs. 
Also, plugin gives you ability to open external / affiliate URLs on new window.
Features:
<ul>
<li>Ability to create multiple buttons with external / affiliate URLs</li>
<li>Ability to open external / affiliate URLs in new window – configuration per product</li>
<li>Ability to display additional external / affiliate URLs on shop/category page – configuration per product</li>
<li>Ability to change additional button templates by hooks – <code>mepu_woo_product_page_template</code> and <code>mepu_woo_shop_page_template</code></li>
</ul>

Multiple external product URLs for WooCommerce

Thanks

Plugins gives you ability to add multiple external product URLs on WooCommerce product edit page.

Common Links vs Multiple external product URLs for WooCommerce