Hi,
1-
Our support doesn't include "custom modifications", so I can't assist you which line you should move to where, You should figure this out by yourself. Because it is a "custom" change.... but the file you need to make edits is this:
ROOT/templates/<yourjoomlatemplate>/html/com_virtuemart/productdetails/default.php
2- look here:
www.flexiblewebdesign.com/index.php?option=com_kunena&view=topic&catid=6&id=414&Itemid=234
3- That "delivery mode" is a "custom field" that you have created. I don't know why you created that custom field and for what purpose. Unpublished that custom field from Virtuemart Configuration, then it should be gone.
By the way, while creating "custom field" use the "Cart Variant" option, not any others. "Cart Variant" type is more convenient way to create product attributes and more user-friendly for buyers.
Regards.
Forum Support.