In Chapter 12, Creating Portable and Reusable Transformations, you learned to copy a set of rows in one Transformation, and to access the copied rows using the Get rows from result step. Doing this allowed the rows to flow from one transformation to another. This is only one of the uses of the copied rows.
In general, when you copy rows using the Copy rows to result step, the copied rows become available to be used by the entries that are executed afterward. The next subsections shows you the possibilities.