Hi,

To define dependencies between operations in Odoo Manufacturing:

1) Enable Work Order Dependencies:

Go to Manufacturing > Configuration > Settings. Under the Work Orders section, enable "Work Order Dependencies".

2) Enable 'Operation Dependencies' in the BoM:

Go to Manufacturing > Products > Bills of Materials. Open the BoM of your product. Under the Miscellaneous tab, enable "Operation Dependencies".

3) Configure Dependencies Between Operations:

In the Operations tab of the BoM, click on each operation line to open its details. Use the "Blocked By" field to define dependencies:

Select the operation(s) that must be completed before this one can begin.

 Example:

Cutting Wood Operation: Set "Blocked By" as blank.

Drilling Holes Operation: In the "Drilling Holes" operation details, set "Blocked By" to the "Cutting Wood" operation.

For more details, refer to:

https://www.odoo.com/documentation/18.0/applications/inventory_and_mrp/manufacturing/advanced_configuration/work_order_dependencies.html

Hope it helps