I'm fairly new to Odoo. I've set up my product's BOM. It includes a top level product and subproducts that are assembled by subproducts further down that are eventually purchased. I've triple checked that the assembled products have "Manufactured" routes and the purchased items have "Purchased" routes on the product info. I can look at the BOM structure and see that it drills down correctly.

I have 0 inventory of everything. I'm interested in doing "Make-to-Stock". I have no sales, but I want to put in a manufacturing order for 50 top level units. I put in my manufacturing order, expecting that it would create further manufacturing orders for the subassemblies with 0 inventory, and eventually RFQs/POs for the components to buy that have 0 inventory. But none of that happens. I just have a top level Work Order that can't be continued.

What am I missing? I checked the following resources, but none of them cover this use case. I'm not making a reorder rules, because I want the Manufacturing Order to drive the need for purchasing, not because inventory is low, not because there's a Sales order. Because I put in a Manufacturing Order. Is that possible in Odoo version 12?

https://odootricks.tips/about/odoo-applications/using-routes-and-rules/#MTO

https://www.youtube.com/watch?v=4fdtROz9LHY

https://www.youtube.com/watch?v=PjZJVKT_AF4