Create Color Highlight Programatically

Dear all,

I have a RPT file which contains a chart:

I can use Crystal Report to create color highlights based on values in Transaction.Group:

However, since the values of Transaction.Group is varied (based on the inputted data),

Can I create Color Highlight programmatically (in my program writtern in Visual Studio 2013, which uses libraries CrystalDecisions.CrystalReports.Engine.ReportDocument to load the RP).

Thanks,

Stephen