How to show a user-made selection in a summary slide

Thanks, I will have a further wander around. Mainly looks like I would need a long bunch of triggers with IF AND statements. Wondering if the end justifies the means and I should just go with a duplicated slide as a layer in my summary that only shows or visually marks the selected products. Is at least way easier to implement and, more importantly, to maintain. Sometimes "good enough" trumps "perfect", right? :-)