View the list of available external columns in the data source. You cannot use this table to add or delete columns.
View external (source) columns in the order in which you will see them when configuring components that consume data from this source. You can change this order by first clearing the selected columns in the table, and then selecting external columns from the list in a different order.
Provide 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 provided will be displayed within the SSIS Designer.