What you can try to do is drag your display configuration over to the host drawing that you have set up in the XREF. To do this open both files and then in one open the Display Manager. Drag the display configuration over from the XREF file to the host that you have set up to show the objects you want.
Make sure the name of this configuration is unique, so you will have to change its name in the XREF file.
If you have made changes to the representations by object style too that will have to be dragged over as well.
The host drawing controls the display configurations. If they exist in one and not in another than the host will just display it according to how its display configurations are set.
It could be that since his model was created n another application that you may not get it looking exactly as you wish because it was not created specificly for this applicaion
If you are unable to resolve this please forward both the XREF file and the Host file and I will see what I can find.