Multi-level custom fields

Hi!

As a stopgap for being able to create any sort of automation, having the ability to create interlinked custom fields (as in, child-parent). It would create a rudimentary level of automation where some fields are filled out by default in column B, based on the selection in column A.

Both columns would get treated as a separate custom field for all other purposes, except that it would have a default value in column B based on the choice made in A.

Ideally you could expand this further than just columns, this would remove a part of the tedium in bulk filling information that largely remains the same.

As a practical example, we have a large list of locations, where it would be very convenient to be able to auto-sort these into larger "zones", instead of having to manually look the correct zone every time.

I created a mock-up, which you can find attached.