In RE wizard, user cannot filter at the z/OS database level.
Each RE of a DB requires user to pick through and manually check a few dozen of the 500 tables.
It should be possible to define database name in connection properties, plus use the schema filter items in Reverse Engineering wizard.
WORKAROUND:
None
STATUS:
Enhancement request ST110149 has been submitted to Development for consideration in a future release of Toad Data Modeler.