Completing Dynamic Values

I was hoping you could help me with this question.

I am needing to create a shortcode that can call the value of the Stock field on each particular listing.

For example, check this out – http://style.agentauto.com/inventory/200/
On the left, I have a form by formidable pro. They allow to put shortcodes into the fields if you want to dyncamically fill the form. How could I dynamically call the stock number? I would think it would be done by creating a shortcode around the Stock number php line
<?php if ( $fields[‘stock’]){ echo ‘

• <span class=”strong”>’.$options[‘stocktext’].’:</span> ‘.$fields[‘stock’].’

‘;}else { echo ”; }?>

Logated in the Single-GTCD.php file.

Any suggestions?