Log onto an RPA in the Site A cluster as boxmgmt and under Cluster operations you will see a remove cluster option. This will allow you to remove cluster B from cluster A.  Regards,  Rich
I have two clusters, site A and site B. Each site cluster contains two RPAs. I know how to detach RPAs from a cluster. If I detach both RPAs from site B cluster, how can I disconnect (delete, remove) site B cluster from site A cluster?
How to Detach a Cluster