As the technologies facilitating the Semantic Web become more and more mature they are also adopted by the business world. When developing semantic applications, constructing the underlying ontologies is a crucial part. Construction of enterprise ontologies need to be semi-automatic in order to reduce the effort required and the need for expert ontology engineers. Another important issue is to introduce knowledge reuse in the ontology construction process. By basing our semi-automatic method on the principles of case-based reasoning we envision a novel semi-automatic ontology construction process. The approach is based on automatic selection and application of patterns but also includes ontology evaluation and revision, as well as pattern candidate discovery. The development of OntoCase is still ongoing work, in this paper we report mainly on the initial realisation and first experiments concerning the retrieval and reuse phases.