TMOEDMxx in CTAPOPTN is where you would define the EDM tapes to CA 1. This is documented in the Programming Guide.
If you need to change the ARCTVEXT module which HSM and OAM can call when a tape is to be released you can look at the current source in CTAPSAMP in member TMSARCTV. To install your changes you can use the JCL found in CTAPJCL member SMPHSM2.
For HSM you need to tell it to call the exit:
Specify in the HSM options: SETSYS EXITON(ARCTVEXT)
For OAM (object access method) you need to tell it to call the exit:
SYS1.PARMLIB member PROGnn needs to have the following added:
EXIT ADD EXITNAME(CBRUXTVS_EXIT) MODNAME(ARCTVEXT) STATE(ACTIVE)