If you want the values to be read only, the easiest way is to create read only custom fields on the additional pages, and set the source to be a sql query that refers to your custom field.

Hello @Hypervox 

Unfortunately, that cannot be a solution, as the user would need to fill the CF either via the customer order or the customer order line screen.

So, from what I understand, there is no way to share the CF in these screens, so I would have to create events for that

@romsar, that is correct. A custom field is always linked to one single entity.

If editing IS NOT required in the other screens , read only fields can be created on the Entities and added to the pages.

If editing IS  required in the other screens, separate persistent fields have to be created and events/workflows are required to update the field.