Thanks very much @rkaplan 
Most kind of you.
@shmavon please excuse me for hijacking your thread. To return to your original question: I link documents in DT by using an annotation (Inspectors/Annotations & Reminders; ⌃3) to one of the documents into which I paste the relevant links. For any file who’s link is in the annotation, the annotation will be shown as an incoming link in the links section of the inspector.