The OfficeWriter Designer has the ability to work with reports that are created in Report Builder and Visual Studio, but it also provides a way to develop reports from scratch within Excel using MS Query.
By default, the OfficeWriter Designer MS Query functions for adding, editing, and removing queries are disabled and will not appear in the OfficeWriter Designer toolbar.
To enable MS Query for the OfficeWriter Designer:
Once MS Query has been enabled, the Add DataSet button will be available. The Edit DataSet and Delete DataSet options will become available through Data Markers > DataSets once a data set has been added to the report.