Conditional Discounts for VirtueMart is a package containing a backend component, a module and a plugin to manage conditional discounts - discounts which are available when you buy together two or more products.
The component controls the relationships between products. You can define master products by selecting individual VirtueMart products and categories, associate with them slave products, in similar way, select a discount type (percentage or fixed amount) and discount amount, and promotion validity timeframe, wich can be a timeframe delimited by startand end date, an open ended period - with setting up only a promotion start date and end date, or none of them.