Remember that you can use the offline utility program, DFHCSDUP, to examine and amend CSD files; and that DFHCSDUP can be invoked from a user program, running either in batch mode or under TSO. (See User programs for the system definition utility program (DFHCSDUP).)
Using DFHCSDUP is the recommended method for updating CSD files in bulk.
You should only use the interface described in this section where the required function includes the INSTALL command, which is not available from DFHCSDUP.