How do I externally link a CorelDraw file into another CorelDraw file without rastoring?

I want to link several Corel drawings into a separate Corel drawing to form a flowchart, and I want the linked drawings to change when I make changes in the original drawings.  However, I also want the linked drawings to be scalable, and not rastor if I change their sizes in the flowchart, and it seems that CorelDraw will only let me link non-scalable formats, like bitmaps. Does anyone know how I might accomplish this? Thanks!