To import an image file into LabVIEW, all you need to do is place this image in the clipboard and paste it to either your front panel or diagram. In your case you would want to open Autocad v14, select your image and select Edit -> Copy. Then from the LabVIEW menu, you would select Edit -> Paste.
As far as I'm aware, this process can be done in all versions of LabVIEW, not just LabVIEW 6i.