Add a Cluster Add a PBS Professional cluster so that allocations can be tracked at the HPC. Only an Budget Manager administrator can add a cluster. Click the Configure tab. Click Clusters from the Budget Manager menu located on the left-hand side of the web page. Click . Figure 1. Add a Cluster For Cluster Hostname, enter the hostname or IP address of the PBS Server. Valid characters are A-Z, a-z, 0-9, underscores, dashes, period, tilde (~). Click Register. The cluster is added.