Begin building a query by connecting to an SAP BW data source. Use the Query Builder - Connection page to connect to a data source.
The available sources are the data sources that have already been created. (See Creating an SAP BW Data Source Connection.) Click New to create a new data source, Edit to edit the information on an existing data source, Rename to Rename the data source, or Delete to delete the data source.
To connect to a data source, select an existing data source under 
to move it under