In order to make the product button in POS to use stock in your warehouse, you need to create a corresponding warehouse product. These warehouse products are also used in recipes. The same warehouse product can be used in multiple recipes. For example, you only need to create one cucumber warehouse product and use the same warehouse product in multiple recipes.

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Remember to link the created warehouse product to a sellable product and recipes.

The guides for that can be found here:

WAREHOUSE LINKING FOR PRODUCTS

RECIPES