In the Expression Builder, select the Data Sources tab.
Double-click the ID field and type a new name for the data source alias.
Click the 
Add Data Source button. The Data
Source Browser appears.
Select a data source and click OK. Configure the data source as required. For data source-specific information, see Data Sources.
If you want to configure time update settings
for the expression, click the 
Advanced Settings button. For more information on how
to configure time update settings, see To set data source time
update options.
Add additional data source aliases as required. If you need to add more rows, click the More button. Five new rows will be added.
