One card in two decks

is there a way i can make one card with a formula on it and have that same card in 2 subdecks, so if i forget the card it will carry across to both, but if i want to cram a deck it will be included even though it is relevant in both topics.

No, a card can only be in 1 deck.

To make sure that a card is included in multiple topics, you should tag the note with those topics instead. Adding/Editing - Anki Manual

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