The Builder is a batch utility that takes as input a file of basic affinity-transaction-group definitions created by the Reporter. It produces a file of "combined" affinity-transaction-group definitions suitable for input to CICSPlex® SM.
You must combine the basic transaction groups because of a CICSPlex SM rule stating that a specific CICS® transaction ID (TRANSID) can appear in only one transaction group. Because a TRANSID might appear in more than one basic group, you must combine them to form larger groups to satisfy CICSPlex SM.