"Look in your main VirtueMart configuration, "Store" section, "Edit Store". Under the "Store Information" section there is an option called "Minimum Amount for Free Shipping: ". Set this to your desired free shipping amount, or zero to disable.
I do not see this, the store information just has the store owner as a vendor?? When setting the Minimum Amount on the Shipping Rate its self it does not work... any ideas??