Computer integrated manufacturing practices require the sharing of product information between functions, which is the larger context for the work presented in this paper. We are addressing the problem of converting from one feature-based representation to another, where the second representation is for a different application than the first. In particular, we are focusing on converting a design-with representation of a component into representations suitable for manufacturability evaluations. We offer a methodology for describing conversions as a three-step process: filtering information, such as features and geometry, out of the primary representation, selecting those entities that satisfy conditions appropriate to the secondary viewpoint, and aggregating entities into secondary viewpoint features. This methodology is applied to the conversion of a component from the design viewpoint to the injection molding viewpoint for the purposes of tooling cost evaluation. Results from the injection molding conversion, and several others under development, show that our methodology supports conversions at early design stages and suggests broad applicability.