Hi I know this maybe more of a opencart thing and not related to shoppica but was wondering if anyone knows if there is a way to incorporate a half off feature if a certain product is purchased?

The products are all in the same category.
It is one unique product and if it is purchased the other 2 products will be half off.
There are 3 products in total.

Basically I need the discount to be product specific. Without applying the discount to itself or the other products using the discount.
logic of:
A by itself = no discount
B by itself = no discount
C by itself = no discount
B+C = no discount

A+B = discount
A+C = discount
A + B + C = discount

The discount will only be applied once if there is more than one quantity of purchased items.

If anyone knows anything like this would be a great help.

Thanks!