To create a new query using existing data source, follow the steps below:

1. Open MS Excel
2. Click Build DataSet on Aspose.Cells.Report.Designer.
3. In the dialog box, select a data source listed in the left panel, for example select SqlServer and click Add button.

4. In the dialog box, type a new data set name, for example SalesEmps and click Next button.

5. Aspose.Cells.Report.Designer will start MS Query and connect to the data source that was selected in the step 3. Users can create a new query in MS Query now.

6. From Microsoft Query's File menu, select Return To Aspose.Cells.Report.Designer.

7. Now the DataSource “SqlServer” contains two datasets, and one of them is the newly created dataset SalesEmps.