To model a hierarchy between clusters, use the IE Data model or the eERM model. The hierarchy between clusters is represented by the consists of/is part of (CT_CONS_OF_2) connection as a direct connection between two clusters in the IE Data model or as an implicit connection built by assigning an eERM model to the cluster.
In ARIS Risk and Compliance, only a tree structure for hierarchies is allowed. Therefore, each cluster can only have one superior cluster.