CUA with QAS and TRAINING

Hi,

i have a CUA with a child system, but the child system has 2 clients (for exemple 100 and 200) one client for tests and the other for training.

the CUA is also a data source for our EP7's UME.

my question:

how can i create a user_test for the child system but only for the client 100 (not authorized to have access to client 200) and vice versa

best regards