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In the tax/accounting sector tax an laws change yearly.

Instead of having pocket manuals, pdf files for lookup of tax rebates, rates etc. the Tree will be a great tool like:

Tax 2022
  - Allownace
     - Car
        Rate Domestic
        Rate International
     - Bus
     - Plane

Discus the option to copy the specific tree like "Tax 2022" and then edit it to "Tax 2023"

This way all the work was done and you just need to edit the data that changed.

Button on editor screen with an Append Query. The relationship is the difficult part to append all layers.