You can create Data Processing Items in the Data processing Unit.
- Go to the Data processing Unit.
- Click on the data processing of your choice.
- Click on the tab Mapping.
- Click on the button "New DataProcessing Item".
- You can edit its name, description, and type (bottom of the screen).

Note: You can create different types of data processing Items:
- Aggregate,
- Analytical calculation,
- Concatenate,
- Constant/Variable,
- Convert,
- Copy,
- Custom,
- Filter,
- Formula,
- Inner Join,
- Lookup,
- Outer Join,
- Substring.