Manufacturing practices such as mass customization mean producers are often making changes to their product and its respective packaging. Many of these changes arise over short periods due to marketing and customer demands. Some products are stable over long periods whilst others are short lived or seasonal. This paper presents an approach employing the capability of a constraint-based modelling environment to model and simulate variations in machine design configuration to cope with evolving product. The paper continues to explain the product effects, and how understanding product constraint relationships can offer the full understanding of the processing capability for the change product.