You can achieve this requirement by using the "Restrict Production Lots" feature. This feature allows you to restrict the production of a parent manufacturing order until all its child manufacturing orders are produced.

Here are the steps to set up this feature:

Go to the Manufacturing app and select a Manufacturing Order (MO) that is a parent of other MOs.

Click on the "Edit" button to open the MO in edit mode.

Scroll down to the "Operations" section and click on the "Restrict Production Lots" button.

In the pop-up window, select the child MOs that you want to restrict production for.

Save the changes to the parent MO.

Once you have set up the "Restrict Production Lots" feature for a parent MO, the system will prevent you from producing the parent MO until all its child MOs have been produced.

If a user tries to produce the parent MO before its child MOs are produced, they will see an error message saying that the production is restricted until all the child MOs are produced.

Note that this feature requires that the MOs are linked together as parent and child MOs using the "Source MO" field in the child MO. If the MOs are not linked together in this way, the "Restrict Production Lots" feature will not work.