Workflow Manual Transitions

In one of our workflows we have multiple transitions for a phase.  I have the box checked to "Save record prior executing the transition" selected.  In the rule sets that are executed on update for that phase, I want to limit which ones are run based on the transition that was selected.

How can reference the workflow option number, name, etc.. for the selected transition?

With display options I could set a variable, then limit based on that variable, but with workflow transitions I don't see how to do it.  The systems seems to store which action was selected in a variable like vars.$wf_option or vars.$L_wfAction , but neither seems to be available for Rule Sets.

Thanks for any input.