You can reference a PLN by Hotlinking.
Import the DWG via the Drawing Tool, not XREF, and you can adjust the boundaries of the drawing as you can with other polygonal elements.
MacBook Pro Apple M2 Max, 96 GB of RAM
AC27 US (5003) on Mac OS Ventura 13.6.2
Started on AC4.0 in 91/92/93; full-time user since AC8.1 in 2004