Hello Valentine,

  To set default locations for BoM components in Odoo 18, you'll need to adjust the configuration of your products and possibly use routing if necessary. Here's a step-by-step guide:

  1. Ensure each component product (B, C, D) has its inventory location set correctly in the product form under the Inventory tab. This specifies where the product is usually stored.

  2. Check your Manufacturing Order's operation type (Manufacturing) to ensure it's pulling from the correct source location. This can be found under Inventory > Configuration > Operation Types.

  3. If the above doesn't solve the issue, consider using routings to specify detailed operations for your manufacturing process, including exact source and destination locations for each operation. This can be set under Manufacturing > Configuration > Routings.

  4. Remember, for the routing to take effect, ensure your Bill of Materials (BoM) for Product A is linked to the correct routing that specifies these detailed operations.

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As an extension to this problem, we have many parts that are in multiple locations. Think common parts used in many different assemblies at different workstations. How can we define where the parts are picked from? (Alphabetically is a weird management practice). Is there a path to have a discreet pick location per line item on a BOM? I don't want one assembly pulling parts from rack 1 when the station is next to rack 4.

I feel this is what the original question was asking...?

You are following the correct flow — to achieve the expected behavior, you just need to ensure that the specific shelf locations (e.g., Shelf B, C, D) are configured as sub-locations of WH/Stock.

Once this is set up properly, Odoo will recognize those shelves as valid source locations during the manufacturing process, and components will be pulled accordingly from their respective shelves.