In a mapping or mapplet, drag a Union transformation from the Transformation palette to the editor.

On the

General

tab, edit the transformation name and the description.

Select all the ports from the upstream transformation and drag them to the Union transformation. The ports appear as ports in an input group and output group of the Union transformation.

Click

New

on the

Groups

tab in the

Properties

view to add an input group.

Select the ports in the output group of the Union transformation and drag them to the downstream transformation in the mapping.