If you are printing directly from the Archicad plan then there is an option to "Print ghost storey" in the print dialogue box.
If you are printing from the layouts you can't do this.
However you can overlay a second drawing of the plan you want as ghost and set it to have grey pen colours (you may need to set up a new pen set for this purpose).
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11