Hi @pagol,
One way to achieve this would be: First, have two pages, one to display the Choices/tabs and the other one to display the posts for a particular chioice/tab.
On the template for the page that displays the posts, add the following code:
$value = $_GET['value']; // get value of selected choice.
$args = array(
...
'meta_key' => '<select_field_name>',
'meta_value' => $value
);
$the_query = new WP_Query( $args );
... // display posts
Where $value will be the value of the selected choice/tab passed through a query string e.g. The CK tab could open this link http://your-domain.com/page-that-displays-posts/?value=CK
For more info on this, have a look at the following resources:
Filter posts by custom fields,
Creating a WP archive with custom field filter
