Deep copy lists (cross reference other lists, or master watch list)

[Alan]

It sounds like you want this:

Transclusion/clone (display item in multiple places)

(Moved from Trello; you can vote for this feature and see past discussion at https://trello.com/c/zrla0Fmx/150-clone-display-an-item-in-multiple-places) This feature would allow you to “insert” an item elsewhere. This is not a copy, as the updates of the original item will be reflected everywhere that it’s referenced this way. “Clone” is a temporary name for this feature, lacking a better name. Cloning still indicates having multiple copies (in the sense of cloning an animal), but that’s not …

If so, it doesn’t exist yet but you’re not alone in wanting it.