I have a DXF file that is linked to my design. How can I change it to be imported?

Bring up the properties for the floor and select the storage tab. If the file is currently linked, that option will be selected. To change it to be imported all you need do is to select the other option and save the file. When you reload your design file it will contain your floor plans without re-reading the DXF file. Once you have changed from linked to imported you can't go back. If you subsequently change the DXF file you will need to delete the floor from your design and create a new floor with the new DXF file.