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cCTS is not supported yet, we are not supporting/using transport collections and system clusters. There is currently no plan to support cCTS in future.
Currently cTMS is and ATO are not supported. We will support it soon. As workaround you can use and integrate ChaRM with our solution CC4 instead of CC5. Since ChaRM is supporting cTMS, we are supporting cTMS indirectly by CC4.