In an exemplary embodiment, a computer-implemented method for obtaining a persistent design portion of an executable model is provided. The model includes on or more design details, a design detail specifying one or more aspects or elements of the model. The method also includes obtaining a design description of the model and a user selection specifying a design detail to be included in the design portion. The method further includes generating a selection specification from the user selection, obtaining the design portion by processing the design description according to the selection specification, and making the design portion persistent.