All operations are conditional:


For example, when adding an operation StampPDF:


The condition appears at the top of the action to be added:


Simply check Condition, then using the Field Concatenation tool, select the variable to test:


Select the type of equality:


Then you have to add the value to test, which can also be the value of another variable, or a simple free text:


Each operation being independent, they will be carried out or not according to different conditions.

The conditions not met will appear in the task logs.