If you want to assign the default blog post taxonomies to your custom post types then you can easily achieve that using this powerful function PHP code snippet.
/* Advanced Scripts Method to Add This Snippet */
function my_cptui_add_post_types_to_archives( $query ) {
// We do not want unintended consequences.
if ( is_admin() || ! $query->is_main_query() ) {
return;
}
if ( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {
// Replace these slugs with the post types you want to include.
$cptui_post_types = array( 'custom-post-type');
$query->set(
'post_type',
array_merge(
array( 'post' ),
$cptui_post_types
)
);
}
}
add_filter( 'pre_get_posts', 'my_cptui_add_post_types_to_archives' );