After you add and configure a transformation in a mapping, you link it to targets and other transformations. You link mapping objects through the ports. Data passes into and out of a mapping through the following ports:
Input ports.
Receive data.
Output ports.
Pass data.
Input/output ports.
Receive data and pass it unchanged.
To link ports, drag between ports in different mapping objects. The Designer validates the link and creates the link only when the link meets validation requirements.