Derived fields
Derived fields are variables that do not exist in a data source and are created from one or more existing fields, even across different data sources.
In many processes, the configuration window includes a Derived fields button that you can use to create a new variable for querying, segmenting, sorting, calculating, or providing output to a table.
You can make derived fields that you create explicitly available to a subsequent process by enabling the Make persistent option when you create it.
Derived fields that are available to a process are listed in the Derived fields folder. Derived fields are available only for the process in which they were created. If you have not created any derived fields in a process, no Derived fields folder appears in the list.
To use a derived field in another non-subsequent process, store the derived field expression in the Stored derived fields list so it is available for all processes and all flowcharts.