You can make an exact copy of your own case or someone else's case complete with any namelist or source code changes by creating a clone. To create a clone:
Note: The $CESM_ROOT must be the same $CESM_ROOT used to create the case, from which you are cloning ($CLONENAME)
>cd $CESM_ROOT/cime/scripts >./create_clone --clone <clone_path+$CLONENAME> --case <your_path+$CASENAME> --cime-output-root <your_output_path> |
A new directory $CASEROOT = <your_path+$CASENAME> is created.
From within $CASEROOT, the steps to set-up, build, and run your new cloned case are exactly the same as when you created a new case. See Run CAM-Chem on Cheyenne (Step 2 - 11) for more details.