Each requested transformation contains properties that can be set by editing the properties of the column node for that transformation.
In the ‘Transformations…’ window, click on the column that was added when the transformation was requested, for example, column cust_id under Bin Code.
Variable Transformation > Bin Code function > cust_id
With column highlighted, click Properties.
Variable Transformation > Input > Bin Code Properties
You can also double-click on the column name to bring up the Properties dialog.