How to reference a Drawing Model back into the 3D model from which it was created from?
In the 3D mode under the References dialog box go to Tools > Attach. In the Reference Attachment Settings, select the Model, in this case will be the Master Model. Then under "Orientation" expand the "Saved Views" and select the Drawing Model of your choice, set Nested Attachments and Nesting Depth as desired, then hit OK.
The Drawing Model should be now referenced in the 3D model.