It is the same answer as for your previous question - the code is all there in the templates - have a look at it - see what it does - then try to duplicate it - but - you really can't expect us to recode your template to your wishes - as before - we can advise on a good developer if you need one..

Cheers

Perfectly fair

templates/your_template/html/com_virtuemart/productdetails/default.php starts around line 777

and javascript to control it right at the top of that file

but have you used the tabs available in the flexible web plugin? (system plugin)?

There are two more there you can configure

Ive used extra tabs to display information from custom fields and also related products (as well as using the extra ones available within the system plugin).

If you run a search against my name, K, you will see an admin guy helped me with the code needed a few weeks back.