A list of available external columns in the data source. You cannot use this table to add or delete columns. Select the columns to use in the source. The selected columns are added to the External Column list in the order they are selected.
A view of the external (source) columns in the order that you see them when configuring components that consume data from the CDC source. To change this order, first clear the selected columns in the Available External Columns list, and then select external columns from the list in a different order. The selected columns are added to the External Column list in the order you select them.
Enter a unique name for each output column. The default is the name of the selected external (source) column, however you can choose any unique, descriptive name. The name entered is displayed in the SSIS Designer.