If all of these are supposed to be on the main dashboard I would combine this to display all at once:
if( function_exists('acf_add_options_page') ) {
acf_add_options_page('Showrooms Global');
acf_add_options_page('Case Studies Global');
acf_add_options_page('Jobs Global');
}
Then I would register your new menu on its own since it should appear in your appearance button:
function register_my_menu() {
register_nav_menu('showrooms-menu',__( 'Showroom Menu' ));
}
add_action( 'init', 'register_my_menu' );
Easiest way would be to display it in a div wit the $ sign in the code if it will always be there:
<div>$<?php the_field('text_field'); ?></div>