For any curve in a plot, you can preserve the curve or a copy of that curve. The preserved curve will have no dependency on current results and will not change once created. You can still modify the display settings of this curve as you would any other curve.
To compare plot results:
In the Browser,
expand the branch under the desired plot, right-click on the curve you
want to compare, and then select Preserve
and Copy.
COSMOSMotion creates a copy of the curve, with the suffix Preserved.
Simulate again with different inputs.
COSMOSMotion superimposes the new curve on the one you just preserved,
therefore making it easy for you to compare the results between simulations.