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Models in Creo have all sorts of uses during the design process, from concept ideas, analysis simplifications, and manufacturing process development. All of these may require a new model state for the released object. Assembly level cuts also introduce additional complexity to the design cycle. This session discussed how Solar Turbines is using Creo Apps along with Windchill to manage and release files using a "Derivative Model" procedure. The procedure allows for design, engineering, manufacturing and others to share a base model, identify and make changes without the design model being modified, but with traceability of the changes being made.