When adding Pre and Post Build commands to your Build Jobs there is some documentation on this in the Serena ChangeMan Build Development Guide, version 6.3.1, pages 115 - 116. Here is a sample command for om listed in the documentation (page 116).
The following is the report that we got: Serena ChangeMan Builder powered by Openmake(R) V6.3 Build 101504, Copyright 1995-2004 Application BATCHARCHITECTURE from DEVELOPMENT for all targets.