Manufacturing service provisioning is one of the most important objectives of a virtual fab (VF). In this paper, we design a dynamic binding mechanism for creating a manufacturing service in a VF, especially the order management perspective. The mechanism is developed on top of object-orient modeling of a virtual fab. Key steps of the mechanism include name and resource mapping, business and operation process binding, resource reservation and service management binding. A simple example serves to illustrate the ideas, which are further described by a computer-aided software engineering tool to demonstrate the potential of the dynamic binding mechanism for real applications.