marking related records?

Hi folks, sometimes I would like to mark records that are related to each other -- for example, the preprint, the article, and a conference presentation that all relate to the same project.
It's not that I want to tag them all with a particular topic -- rather, I'd like to somehow mark them as a group, so that in the future, when I search or navigate to one of those records, I have a little reminder that the others exist too.
Is that possible? Has it been discussed before? Thanks!
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