Hi Jonathan,
What you're attempting does make sense, but as Jiri mentions BP just isn't designed for it.
And I agree with Jiri that tags are the way to go. They were designed for this kind of situation where you need to group items for various reasons. If you need to do this on a regular basis, the process flow should include logic that tags items as they are being worked and then you can search by that tag in Control Room later.
Otherwise, consider having the items auto-retried if you don't need to manually verify anything. the Mark Exception action gives the option to set the item for retry.
Dave
Dave Morris, 3Ci at Southern Company