Is your feature request related to a problem? Please describe.

It's 2024 and @joomla has been around for almost 20 years, but still doesn't have a multi-category feature for articles.

All current options can't solve the problem of how to add display of one article in different categories, and this is the main part of any CCK, because on the Joomla ideas portal the CCK feature was the most popular.

This feature has been requested many times already: #9838 #16553 #23126 #25619 #24454

Describe the solution you'd like

I suggest adding an option additional categories for articles.
Each article has one main category, based on which the canonical URL is created and also each article can have additional categories in which this article will also be displayed.

There should be an option to create the main SEF URL for the article:

1. use the URL of the main category
2. use the URL of the main and each additional category (adding a rel=canonical tag for the URL of the main category).

Additional context

Here's what was done for Joomla CCK:

• Infinite nesting of categories
• Multilingual associations
• Fields and field groups
• Tags
• Microdata
• Workflow
• Custom shortcodes #44506
• Multicategories

We are almost at the finish line for CCK to be completely ready.

Joomla is a CMS, which implies creating large websites with tens of thousands of articles and hundreds of categories, if you use CMS to create a website with 10-15 pages, you can use regular HTML+CSS.

I have been using Joomla since 2008 from version 1.0 and then I migrated to version 1.5, 2.5, 3.4 - 3.9, 4.0 and now I use 5.2 and multicategories are still a very necessary feature.

I have a very negative experience using 3rd-party extensions, because one day many 3rd-party extensions that I used stopped updating and I had to look for an alternative every time.

I have very little trust in 3rd-party solutions when it comes to creating articles.
I would trust 3rd-party developers with components such as forums, galleries, online stores, sliders and everything like that, but not creating articles.