This paper presents an Eclipse-based toolset named xLineMapper to automatically manage the relationship (e.g., traceability, conformance) between product line features, architecture, and source code. The xLineMapper toolset can (1) trace a product line feature to its related architectural elements and code fragments, (2) automatically update both product line architecture and code when a feature is changed, and (3) automatically customize product line architecture and code for a particular product based on its feature configuration. This is an improvement from existing product line approaches which only support either feature-architecture or feature-code mapping. We conducted a case study of xLineMapper with a large open-source software system, Apache Solr. A video demo of xLineMapper is available at https://youtu.be/pdO-vnE8U6w.