I'm sorry - we don't actually build your website for you - if you want this sort of custom work then we can advise on a good programmer - but this is way outside "support"

You need to insert the code to display custom fields in the


templates/your_template/html/com_virtuemart/productdetails/default.php around line 857

<div class="product-description">

the fields are displayed by the code around line 531