I want to ask whether Crystal Report 9 (and DotNet Version of Crystal
Report) supports Run-Time customization (Grouping) or not?
If it does then how?

Also I want to ask whether they support drill down charting or not?
If it does then how?

Regards,
Irfan

Crystal Reports 9.0 (and also Crystal Reports.Net) provide limited
run-time customization of grouping. AFAIK, you can only change the
grouping order that have been pre-defined at runtime. It isnt possible
to add new grouping fields at runtime. To change the grouping field at
runtime:

C#

FieldDefinition groupField = Report.Database.Tables [0].Fields
["Field1"];
Report.DataDefinition.Groups [0].ConditionField = groupField;

Im not sure on your second point. What do you mean by drill down
charting?