Just put those commands in a .ps1 file. They will run one after the other. Use the /l switch to test.
robocopy.exe C:\Source1 D:\Dest1 /s /l
robocopy.exe C:\Source2 D:\Dest2 /s /l
robocopy.exe C:\Source3 D:\Dest3 /s /l
You could also save that as a .bat file and run it with cmd.exe.