The CTS+ integration in 
Usage Engine uses a "loose coupling" approach for handling exports. This means that the export process is performed within Usage Engine, and then the exported file is manually made available to CTS+ for transport and import into target systems.
...
Create the System Export: Use the System Export tool in Desktop, or the mzcli command line tool to generate the export file in
Usage Engine.Make the System Export available to CTS+TMS: Once the export file is created, follow the steps in the SAP CTS+ documentation on thehttps://help.sap.com/ to upload the file to CTS+TMS. When its it is available, the export can be imported into target systems via the SAP CTS+ API.
Note!
When setting up your configurations and system exports, the entire export content will be imported into the target system. To ensure smooth integration we recommend that you:
Use External References for system-specific variables. This ensures configurations are valid for both the source and target systems, with only the External References being system-specific. For more details, seehttps://infozone.atlassian.net/wiki/x/ItckEg
Limit your exports to include only the use cases you intend to import into other systems.