The Purdue industry clusters were created through a joint project between Emsi and the Center for Regional Development at Purdue University. These can be found by clicking Groups in the header bar and selecting Industry Groups, then Template Groups.
Clusters are groups of interconnected industries that typically purchase from one another or otherwise benefit from being nearby each other. Many different definitions exist for different clusters, and we encourage our clients to use their local knowledge when doing cluster analysis. The Purdue clusters can be used as is or you can create a new group based on a Purdue cluster and modify it to your local needs.
See this article on how to create a new group from a template group for more info.