Thank you very much Christoph for your reply.

Yes indeed, I've already set up this process with a Manufacture type production, but I'd like the production to be automatic and not manual.

That's the crux of the problem.

The Kit type doesn't suit me as it only transfers from the default stock, whereas in my case the dishes are produced from the kitchen stock and the drinks from the bar, so after testing I rejected this type

You could have different Routes and Operation types for food and drink, each one picking stock from the appropriate location (kitchen or bar).