You can use global or context variables or reuse the variable defined in the Variables area. Press Ctrl+Space bar to access the list of variables. This list gathers together global, context and mapping variables.
The list of variables changes according to the context and grows along new variable creation. Only valid mappable variables in the context show on the list.
Docked at the Variable list, a metadata tip box display to provide information about the selected column.
Related topic: Mapping variables