Create subdecks from its parent deck

I have a deck called “countries”. Its cards contain 3 field: “country name”, “flag” and “capital”.
I would like to create a 2 permanent subdecks pulling cards from “countries”. One would contain the cards using card type “flag → country name” and the other one “capital → country name”.
Do I have to create two subdecks and move the according cards to them or is it possible to maybe create something like a permanent filter deck which acts like a normal subdeck?

There is no feature to create rule based decks.

If the goal is just to place different card templates in different decks, you can use “deck override” for that:

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