Yes.

To directly output individual extra fields in your K2 overrides, do something like this (e.g. in item.php) to get the extra field name:
To get the extra field value you would simply do this:
Simply replace EXTRAFIELD_ALIAS_HERE with the actual alias of the extra field you wish to output.

In modules, use:

When you say "need to call some of K2 extra field like shortcode to render data inside the article", do you actually mean the WYSIWYG editor? If so, this is not currently possible as it would require a plugin to do that (perhaps a generic plugin to render PHP would work).

However, is there really a point in doing that? The K2 item form is input and the resulting page in the frontend is output. You want to render the output into the input page. It would only confuse your users...

If you explain WHY you want to do this, I might be able to provide a more elegant solution.

Then you should be looking at a plugin that copies the extra fields (values) from another item as its own. The gist is that both items should belong to categories that use the same extra fields group so that when you load to edit the item with the copied values, they show up just fine in the K2 item edit form.

Since this is a bit of an edge case, we can custom build the plugin for you if you sponsor it and we can open source it afterwards so it's constantly maintained by either us or other volunteers/users.

If you're interested, send us an email using the contact form here: www.joomlaworks.net/support/contact

K2 Community to the rescue! Thank you Mohamed!