Planning a New Product Development (NPD) process has an evolving nature. It is repeatedly updated during the development due to changes in requirements, technology, product concept, or testing results that drive product design modification and require changes in the plan. The Design Structure Matrix (DSM) is utilized to generate a process plan that is based on the product knowledge. The translation of the DSM-based plan to a DSM net process scheme requires implementation rules. Such translation is not unique and there are implementation choices we define as business rules. This paper presents the implementation rules used for dynamic changes in the plan. The application of these rules conforms to a correctness criteria based on the soundness criteria used in Petri nets for process scheme verification.