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This seems more of a data structure issue rather than a syntax or coding issue. In your case I’d add a duplicate pizza, one for each size. That way you can still increment the amount. IE:
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Pineapple Pizza (small) 1x
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Pineapple Pizza (large) 1x
You’d have to restructure your data if you’d want to
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Pineapple Pizza 2x (small & large)
Your question doesn’t really show what solution you want.
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