Siebel Loyalty: Custom Attributes

Hi All,

  We can enroll Products under Promotions, so now what we would like to do is, define a base price for this products in the promotion.

For Example

Promotion 1: Has Cola enrolled, i create a new column in the intersection and call it Base price, say 1. This gives out points as Qty *1

Promotion 2: Has cola enrolled, but Base price is 0.75, This gives points as Qty * 0.5

Now a user A creates a Transaction by purchasing cola Qty = 100, at a price of 0.75 which is discounted price. so he shd get 50 points only.

So now my question is can we create custom attributes and use them as criteria, for the above scenario, i could use the attribute in action and evaluate the points, but i would like to know if there is a feasibility of defining Base Price as  a custom attribute and use it my promotion criteria while applying promotion.