If you mean you can compare actual data in your charts with some other you can allow the user to change, I would create a variable in the script (or as many as you need) and a slider object for those variables. Then, include in the charts expressions for calculations with those variables. Say you want to know what if sales amount is increased in certain percentage. The slider will allo the user to select that percentage, storing the selected value into a variable. Then, your chart will have an expressions like the sales mount you actually have, but multiplied by the variable.
Any time the slider changes, the chart will change as well.
Anyway, not know anything else about what do you want to accomplish, is very difficult to give a more accurate answer.
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