Earlier this year I found a new AutoCAD command I had never used before, the wblock command. With it, you can export Selected Elements of an AutoCAD drawing to a single file, keeping the Selected Elements on the file or removing them at the moment of exporting--depending on the option you select.
The command has been really useful for me when exporting portions of a CAD drawing from AutoCAD to Rhino. Hope you find it useful.
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