Hi,
Currently there is no way to list all tables added. It is something being considered because of some other reasons, but the main issue is that tables added with AddTable might not be DataSets at all: they might be for example a TList<> or some other custom types.
The simplest solution would be to add the datasets to a list when you call AddTable. Maybe create some procedure
procedure AddTable(FlexCelReport: TFlexCelReport; Table: TDataSet);
begin
FlexCelReport.AddTable(Table);
MyList.Add(Table);
end;