If you want to copy your SAP client to new client with specific data selection then you can follow the steps…

Logon to target client which you want to create and go to transaction code SCC9

Choose “Source Destination”

Before start the real operation my recommendation is check the “Test Run” selection and make a test copy

Also before start the operation you can configure the “Parallel Process Parameters” just click the related button

And choose the “Maximum Number of Processes” value and click to SAVE button to exit this screen

Also you have to select profiles with “Selected Profile” button and choose which profile you want to use for this client copy operation

Click the “Schedule as Background Job” button to start process, also you can use specific background server for related job.

You can also choose “Immediately” selection to start operation instantly

The last screen is “verification” screen and if everthing is OK then we can start the client copy operation with “Continue” button.