Adding fields to generated data sources These topics provide instruction on working with the generated data sources. Add a database field to an existing recordYou have created the data model (.4rdj) file using the Report Data From Database wizard, but you now need to add more fields from the database.Add a non-database field for computing line totalsWhen using a generated data source, you may need to add a field to compute a line total. This computed field can then be used to provide aggregates for grouping.