Can a Sales Order EFF be used as a "dynamic" variable/result column in a discount rule

Summary:

• On a Sales Order and the rate is populated on a sales order EFF through an integration
• That Freight Rate is then applied to sales order lines based on the Customer on the Sales Order
• The freight can be applied based on:
•   Add Freight on Net Weight
•  Add Freight on Gross Weight
•   Deduct Freight on Net Weight
• Deduct Freight on Gross Weight
•   Add freight to the list price 

Content (required):

Goal: Discount Rules and Price Charge Adjustments can be set up using a “dynamic” Adjustment Amount = Freight Rate EFF value as a Result Column 

Example:

On a sales Order, if