Different variables of the same object to calculate stock

Hello how are you, I have a question, I have to make several variables of a piece, that is, with the same piece I must have a variable that includes 2 pieces, the next variable must include 5 pieces. Always referring to the same piece, is there any way to do it?? Your collaboration would be very helpful, thank you very much!!

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Of course, here for example I have under the arrow an object which has variants (1 and 2) that are the necessary quantities according to the type of order that is made, I need that according to the order that I make this piece takes the value of my variant, be it 1 or 2, as appropriate, to be able to reduce my stock efficiently

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