Hello Michalis Nearchou,

Ensure that the "Make to Order" (MTO) and "Manufacture" options are enabled for the storable product, and that the components are configured as storable products.

I have demonstrated the process of creating child manufacturing orders (MOs) in this link.

https://www.awesomescreenshot.com/video/36860828?key=ea36d5d9789e1a94d5cc73d1d8620617

If you're still unable to create the child MO, check if any installed custom add-ons might be restricting the process.

Hope this Helps,

If you need any help in customization feel free to contact us.

Thanks & Regards,

Email:  odoo@aktivsoftware.com           

Skype: kalpeshmaheshwari

Thank you for the explanation and video. Now it creates child MOs but it is not shown on the top of the MO like your video. It just creates different MO automatically. Also, If I want it to create automatically from any physical location I set it to, not from the warehouse. Is it possible?