In int4 IFTT test case creation is based on re-using automation objects (aka configuration object). The object must be created for each tested interface before first test case. Then it is reused for all other test cases for the same interface.
The configuration manual is split into two section. First describes all possible configuration parameters and available options. Second section is focused on particular test types and explains the settings per particular scenario.
IFTT configuration can be performed through transaction /INT4/IFTT_CONF.