Listing many items once in portal
I have a portal that shows every item a customer has purchased since their first order but many of them are duplicates. I was wondering how I would go about structuring this so it only lists each item once.
My goal is to have the customers be able to just check off their frequently used items and loop through them to make a new order. Any advise is extremely appreciated and let me know if you need any clarification or info on how the portal is constructed. Thanks!