Product Bundles - Restaurant

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I am currently designing a restaurant store and was wondering if anyone know how to create product bundles with unlimited quantities for example, let´s say  a client  wants a chicken sandwich but I want 2 extras of bacon... but I need to know, as the restaurant, that those two extras belong to that sandwich..

Here is the link of my store, I currently have the extras separated on another collection but maybe there´s a way that when someone selects a product, they can add unlimited quantities of another product within the same product..

Thanks for your help! I am using the Express Theme.