Nice idea. Another examples: (Part 26603pb001) and (Set 10182-1) There should be more of those pattern-set or pattern-minifig relations. Hans-Peter In Suggestions, axaday writes: [...] (57 months ago, Sep 11, 2019, to Suggestions)
If you are scratching your head on one of those, try: (Minifigure col072) and (Minifigure col211) In Suggestions, axaday writes: [...] (57 months ago, Sep 11, 2019, to Suggestions)
I would like to propose a new relationship for the catalog. Items that reference each other. Some examples are below. (Gear ctwII007) and (Minifigure col072) === (Minifigure [...] (57 months ago, Sep 11, 2019, to Suggestions)
[...] Those mostly already exist in the interface - invoiced by the invoice icon, payment pending by the grand total in regular letters, payment initiated by the grand total [...] (57 months ago, Sep 11, 2019, to Suggestions)