I don't understand your question, especially this part:
It seems you have a parent-child relationship, with DeliveryNotes being the child table. In such arrangement, there should be a foreign key field in the child table holding the parent record's unique ID value. There should be no fields in the parent table that refer to the parent's children. To display the parent's children on the parent layout you would use a portal.
This is the standard practice for a parent-child relationship. If you have some sort of a special requirement that isn't covered by this then please explain in more detail. For example, if you wish to isolate a specific child record, you could click on it in the portal (thereby setting a global field or variable to its unique ID) and then use a 2nd relationship or a filtered one-row portal to display it.
P.S. Please use the standard font when posting.
P.P.S Please update your profile to reflect your version and OS so that we know what you can use.