Accuracy Thresholds and Returning to Simpler Version if Those are not Reached

[Kate Forte]

I'm a relative E-Prime newbit and I'm currently writing a combined feature/conjunction search task. I was wondering if there's a facility within E-Prime to set some sort of accuracy threshold in the conjunction search blocks such that if those blocks are too hard for participants (i.e. accuracy doesn't reach a certain level), the task will revert to the feature search version?