How to add programmatically a subreport to main crystal report depending on user creteria in C#?

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C#

I have created a small back end application, in which a main form load runs and all the other forms are child forms.
So, I have a form in which I display Orders in a DataGridView depending on users creteria selection dates. When the user chooses between two DateTimePickers Years or months interval I display a Bar Chart for SalesPrices and Years or months and when the user chooses days I display a Line Chart for SalesPrices. So I have created a crystal report for it and I was thinking to load the appropriate chart to a subreport depending on the user selection DateTime creteria. Is there a way to add a subreport to the main crystal report programmatically with source code and if yes how can I do that?
Thank you so much in advanced.

What I have tried:

DataSet ds = new DataSet();
ds = FillMainSQLAdapterWithParameters();
DataSet prodDs = ChartFillAdapterWithParameters();

cr.SetDataSource(ds);
cr.Subreports[0].SetDataSource(prodDs);

FrstReportSource = cr;
                        
this.crystalReportViewer1.ReportSource = FrstReportSource;
this.crystalReportViewer1.EnableDrillDown = false;
this.crystalReportViewer1.Refresh();