Openbravo - Attribute Price Change per Category

We need to add a cost of attributes that is different per category and will change. So this project will also entail a little walk through on how to change Attribute Values in source code to recompile with new categories unless it can be done through a resource file. i.e. Category: Drinks Product: Coffee Attribute: Size Attribute Value: Medium + $2 Attribute Value: Large +$4 Category: Food Product: French Fries Attribute: Size Attribute Value: Medium +1.50 Attribute Value: Large +$2.50 NOTE: It needs to be through core Attributes because of inventory concerns.