A Union transformation has multiple input groups and one output group. Create input groups on the Groups tab, and create ports on the Group Ports tab.
You can create one or more input groups on the Groups tab. The Designer creates one output group by default. You cannot edit or delete the output group.
You can create ports by copying ports from a transformation, or you can create ports manually. When you create ports on the Group Ports tab, the Designer creates input ports in each input group and output ports in the output group. The Designer uses the port names you specify on the Group Ports tab for each input and output port, and it appends a number to make each port name in the transformation unique. It also uses the same metadata for each port, such as datatype, precision, and scale.
The Ports tab displays the groups and ports you create. You cannot edit group and port information on the Ports tab. Use the Groups and Group Ports tab to edit groups and ports.