Hi,

You can try this way

1. You need to set the BOM for each product
2. We can't able set a manufacturing order for 40 products in a single order since it is a distinct product, so we can do a reordering rule, if the product comes to a particular level, we can trigger a MO for those products

Another way we also have the master production schedule for which it is scheduled the production ase don forecast or demand

if the production is based on order using route MTO we can replenish the required Quantity
For more reference, you can refer to this https://www.cybrosys.com/odoo/odoo-books/odoo-book-v16/manufacturing/

Hope it helps