Note:
To add data sources to an existing project, right-click the Data Elements pane, and then click the
Add Data Source link. When you add two or more data sources to a project, they must be matched. Sometimes the system matches them automatically, but sometimes you need to match them manually using the
Source Diagram option. If the data sources are not matched, then the additional data sources you added don’t display in the Data Elements pane, but will display in the Data Sources pane. See
Blending Data that You Added for more information about how to match data sources.