Multiagent systems (MAS) can vary in several ways: by involving different agents, distinct interaction patterns, various forms of agent organizations and environments. One promising approach to consider this variability in MAS is the use of the concept of Multiagent System-Product Line (MAS-PL). The idea is to implement a family of MAS that belong to the same domain, instead of a single MAS. However, there is still a lack of methodological support to develop MAS-PL. This paper tackles this problem with a rigorous respect of software product line principals. We propose an automated approach, the Me-duse for MAS-PL, to generate families of MAS-PL methods that offer software product line best practices integrated with existing MAS development approaches to support MAS-PL development. To illustrate, we present a case study involving a family of MAS-PL methods that extends Gaia and Tropos.