(SSIS) Data Flow Task – export SQL to excel file

I'm looking for a solution / tutorial following case. In the MS SQL database I have two tables (invoice, invoice item). I need to export data to excel.

My problem is the structure of the export excel file.

1. First record from table “invoice”
2. related records from table “invoice item”

3. empty row

4. Second record from table “invoice”

5. related records from table “invoice item”

6. empty row

7. Third record from table “invoice”

8. related records from table “invoice item”

9. empty row

10. ...

11. Last record from table “invoice”
12. related records from table “invoice item”
13. empty row

Does anyone know of a good example?