Gmail "superset" label? [duplicate]

Question

Let's say I have the label Lists/A, Lists/B, Lists/C, etc.

How can I search for all messages tagged with Lists/<anything>?

Answer 1

You must list all labels in which you want to search.

Example: "label:{Lists Lists-A Lists-B Lists-C}"

Unfortunately, parent labels do not automatically include any of the content labeled with children. The nesting is visual only.

More information found here in a related post: Gmail Label Search for Parent Label (including all its children)