To make it more effecient to use i propose the idea of having things in the sales/product warehouse in category of what shop they are selling in
Sales / Product Warehouse Categories
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You can create your own categories for this if you like. I however produce some items that I do not sell in a store but rather to the market. I have created some categories but I find it easier to navigate without them and use the production screen instead. This is my own humble opinion though.
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In a warehouse, you can't create categories.