To make additional input data available to a transform, you can add additional connections. You must define the connection type as either Primary or Supplement. A Primary connection controls the type and outcome of the transform. A Supplement connection does not change the type of the transform; it can be used to provide additional input to the transform, or in an optional condition on the transform.
You can also change the preferences of the Graphical Data Mapping editor. You can set the Let optional connection be primary for transforms that do not accept anymore primary connections preference.
The following steps show how to connect multiple input elements to a transform by using the drag and drop method:
When you have created the connection between your input and output objects, select the required transform as described in Specifying a transform (mapping operation).