Software product lines (SPLs) allow to generate tailormade software products by selecting and composing reusable code units. However, SPLs with hundreds of features and millions of possible products require an appropriate support for semi-automated product derivation. We envision this derivation to be extended by non-functional properties that are associated to code units and domain features. Code units and domain features are commonly organized in different models and connected via complex mappings, what make automation difficult. We propose a model that integrates features and code units in order to allow semi-automated product derivation using non-functional properties.