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I've added a dependent picklist field to Path's key fields. However, it displays only the current value and --None--.
Sub-Stage field when edited in the path:
Sub-stage field when edited from Opportunity Details page:
It is supported as mentioned by krigi in the comments.
A pop-up window will appear if there is any dependencies in the path
If you are looking to edit depended field in the Path's Key Fields area, the controlling field has to be added as well.
Required, but never shown