Connected duplicate records
In complex lists I often want to put an item in two places, but keep track of where both are. My suggestion is a command similar to ^d - duplicating a record, but with a marker in each of them referring to the other - maybe a little symbol linked to the other record? Or an automatically-generated unique tag applied to both?
(The tag approach might make it easier to generate and keep track of more than two duplicates, I suppose)
I think that the scenario you're describing should be solved in the scope of the task https://checkvist.uservoice.com/forums/2121-checkvist-web/suggestions/86089-embed-existing-lists-sublists-not-just-hyperlinks
Basically, what it describes is a possibility to link one branch of the list in another place. A branch can be just a single item as well.
Does it look like the same issue?