The Operators dropdown available in the Rule section provides an explanatory version of the Operations available

Dependant on the operator used the Rule section more parameters will appear that can be applied to the Rule.
No Operator selected

Applying an Operator example:
Using After
Displays a further prompt to use:

Populating the new parameter with the latest parameter, then displays a further Codeset to be referenced in the Rule..


The dropdowns vary dependant on the preceding parameter selected.