The educational material which can be used under various situations has multiple variants even for one lecture theme. The lecturer often constructs and manages the variants separately with ad hoc reuse. This scheme of reuse raises a problem of consistency among multiple variants. To resolve this problem, we introduce concept of software product line engineering into educational material management. Separation of common parts and variable parts in the educational material enable generation of variants depending on reuse scene. We design and implement a generation tool to evaluate the scheme.