Developing systems according to the Product Line Engineer-ing (PLE) paradigm is a process in which dierent types of engineeringartifacts are created with the aim of reusing them in dierent congurationsof the same system. Ensuring that dierent system congurationssatisfy various functional and non-functional properties is ensured byanalyzing dierent artifacts but because they are maintained by dierenttools, sometimes even manually, achieving and especially automatingsuch analyses is a challenging task. Overcoming this issue can beachieved through data integration of existing data which implies creatingan information model that species how will the existing data fragmentsbe related, captures relevant domain constraints, and most importantlycaptures the fact that some data objects are classes in one tool and instancesin another. This paper reports on the experiences from applyingthe Multi-Level conceptual Theory (MLT), to the problem of informationmodeling for data integration in the PLE context. Being a Multi-LevelModeling, powertype-based framework, MLT allows separation of the classand instance facet of modeled entities while keeping them explicit. Someof the MLT modeling constructs are particularly useful for capturing therenement levels of the modeled artifacts and for succinctly capturingconstraints like disjointess or completeness among them. We also reportthat there were certain aspects of the studied case that could not be expressedusing MLT. The studied case comes from a real data-integrationproject from the heavy vehicle manufacturer, Scania CV AB.