Hi there,
If we are looking to offer a discount when 3 products are bought from the same brand, how do we do this?
Maybe have a look at using AwoCoupon - http://awodev.com/products/joomla/awocoupon have a word with Seyi, the developer to see if it could be configured to do what you want.
Joomla 3.6.4? See http://virtuemart.net/news/latest-news/478-joomla-security-release-3-6-5-and-patch-for-joomla-2-5-28
works also with my http://extensions.virtuemart.net/products/quantity-related-price-calculation-detail