Seasonal discounts

[josonet]

hello

we are setting a clothing store
we must be able to discount for season (year), can be done?
I see you can do discounts for families, shoppers, but I can tell you as a series of articles (year) is applied a discount?

I looked at it for buyers, but if I create a new buyer, not out on the web, just get the main buyer, without being registered
if you could do all the buyers come out anywhere without being registered buyers could create seasonal

I can help
thanks

joomla 2.5
virtuemart 2.0.16